Use the noun appendage to describe something that’s attached to something larger. Your arm is an appendage to your body.

Appendage often describes body parts, either on humans or animals. If it’s something that sticks out — like a finger, tail, or leg — chances are it can be called an appendage. The word can also be used figuratively to refer to something that’s associated with something larger or more important, like a husband who’s a mere appendage to his famous wife. In this sense, the word takes on a negative connotation: the appendage is not important.

Definitions of appendage
  1. noun
    a part that is joined to something larger
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    a small appendage
    an appendage to hold onto
    grip, handgrip, handle, hold
    the appendage to an object that is designed to be held in order to use or move it
    appendage added to extend the length of something
    ax handle, axe handle
    the handle of an ax
    broom handle, broomstick
    the handle of a broom
    the stock or handle of a whip
    haft, helve
    the handle of a weapon or tool
    the handle of a sword or dagger
    hoe handle
    the handle of a hoe
    a round handle
    mop handle
    the handle of a mop
    the handle of a pan
    pommel, saddlebow
    handgrip formed by the raised front part of a saddle
    a handgrip that a gymnast uses when performing exercises on a pommel horse
    rake handle
    the handle of a rake
    the handle end of some implements or tools
    gunstock, stock
    the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun
    type of:
    part, portion
    something less than the whole of a human artifact
  2. noun
    a natural prolongation or projection from a part of an organism either animal or plant
    synonyms: outgrowth, process
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    one of the bony outgrowths on the heads of certain ungulates
    any hard protuberance from the head of an organism that is similar to or suggestive of a horn
    a showy growth of e.g. feathers or skin on the head of a bird or other animal
    pseudopod, pseudopodium
    temporary outgrowth used by some microorganisms as an organ of feeding or locomotion
    a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa)
    a filamentous projection or process on an organism
    a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile
    a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin
    small spiny outgrowth on the wings of certain insects
    a slender bristlelike or tubular process
    a minute hairlike projection on mucous membrane
    the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body
    projection behind and above a horse's hoof
    any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals; used for feeling or grasping or locomotion
    bristlelike process near the tip of the antenna of certain flies
    acromial process, acromion
    the outermost point of the spine of the shoulder blade
    a flat wing-shaped process or winglike part of an organism
    alveolar arch
    the part of the upper or lower jawbones in which the teeth are set
    alveolar process, alveolar ridge, gum ridge
    a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth
    a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
    caruncle, caruncula
    an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds
    a round bump on a bone where it forms a joint with another bone
    coronoid process, processus coronoideus
    a sharp triangular process projecting from a bone
    a projection on a bone above a condyle serving for the attachment of muscles and ligaments
    thin projections forming a fringe (especially around the ovarian end of the Fallopian tube)
    (anatomy) a natural outgrowth or projection on an organ or body part such as the process of a vertebra
    spicule, spiculum
    small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals
    small abnormal bony outgrowth
    a small projection of tissue at the base of a hair or tooth or feather
    a small nipple-shaped protuberance concerned with taste, touch, or smell
    appendix, cecal appendage, vermiform appendix, vermiform process
    a vestigial process that extends from the lower end of the cecum and that resembles a small pouch
    mastoid, mastoid bone, mastoid process, mastoidal
    process of the temporal bone behind the ear at the base of the skull
    styloid process
    extends from the base of the temporal bone
    pterygoid process
    two bony processes descending from the body of the sphenoid bone
    eminence, tubercle, tuberosity
    a protuberance on a bone especially for attachment of a muscle or ligament
    zygomatic process
    a slender process of the temporal bone that strengthens the zygomatic arch
    one of the bony prominences developed near the upper extremity of the femur to which muscles are attached
    transverse process
    one of two processes that extend from each vertebra and provide the point of articulation for the ribs
    odontoid process
    a toothlike process at the back of 2nd vertebra of the neck
    the growing part of a long bone between the diaphysis and the epiphysis
    olecranon, olecranon process
    process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended
    any long raised border or margin of a bone or tooth or membrane
    (pathology) an abnormal outgrowth or enlargement of some part of the body
    (botany) a tiny outgrowth on the surface of a petal or leaf
    enation, plant process
    a natural projection or outgrowth from a plant body or organ
    deciduous horn of a member of the deer family
    a bunch of feathers or hair
    showy crest or knot of hair or feathers
    chorionic villus
    one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta
    loosely connected horny sections at the end of a rattlesnake's tail
    cockscomb, comb, coxcomb
    the fleshy red crest on the head of the domestic fowl and other gallinaceous birds
    any of the stiff bony spines in the fin of a fish
    a stiff hollow protective spine on a porcupine or hedgehog
    small needlelike appendage; especially the feeding organ of a tardigrade
    a stiff hair
    sensory hair, vibrissa, whisker
    a long stiff hair growing from the snout or brow of most mammals as e.g. a cat
    a stiff hair or bristle
    hairlike structure especially on the surface of a cell or microorganism
    a bushy tail or part of a bushy tail (especially of the fox)
    bob, bobtail, dock
    a short or shortened tail of certain animals
    caudal appendage
    tail especially of a mammal posterior to and above the anus
    posterior part of a bird's body from which the tail feathers grow
    the skinned tail of cattle; used especially for soups
    either of the two lobes of the tail of a cetacean
    a short erect tail
    a conspicuously marked or shaped tail
    antenna, feeler
    one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste
    barbel, feeler
    slender tactile process on the jaws of a fish
    deltoid eminence, deltoid tuberosity
    a bump on the outside of the humerus where the deltoid muscle attaches
    lappet, wattle
    a fleshy wrinkled and often brightly colored fold of skin hanging from the neck or throat of certain birds (chickens and turkeys) or lizards
    condylar process, condyloid process, mandibular condyle
    the condyle of the ramus of the mandible that articulates with the skull
    coronoid process of the mandible
    the coronoid process that provides an attachment for the temporal muscle
    lateral condyle
    a condyle on the outer side of the lower extremity of the femur
    medial condyle
    a condyle on the inner side of the lower extremity of the femur
    lateral epicondyle
    epicondyle near the lateral condyle of the femur
    superciliary arch, superciliary ridge, supraorbital ridge, supraorbital torus
    a ridge on the frontal bone above the eye socket
    an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)
    an organ or body resembling a stalk; especially the outgrowth of the thallus of certain lichens on which the ascocarp is borne
    (botany) fringe of toothlike appendages surrounding the mouth of a moss capsule
    a root-like attachment in parasitic plants that penetrates and obtains food from the host
    (botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers
    (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
    (botany) a swelling on a plant similar to that on the skin
    nodule, tubercle
    small rounded wartlike protuberance on a plant
    tubular extension at the base of the corolla in some flowers
    a stiff sharp-pointed plant process
    a tapering point
    fuzz, hair, tomentum
    filamentous hairlike growth on a plant
    leaf node, node
    (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge
    a large rounded outgrowth on the trunk or branch of a tree
    type of:
    body part
    any part of an organism such as an organ or extremity
  3. noun
    an external body part that projects from the body
    synonyms: extremity, member
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    either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing
    any part of the mouth of an insect or other arthropod especially one adapted to a specific way of feeding
    an appendage of insects that is capable of injecting venom; usually evolved from the legs
    chela, claw, nipper, pincer
    a grasping structure on the limb of a crustacean or other arthropods
    one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing
    organ of locomotion and balance in fishes and some other aquatic animals
    pleopod, swimmeret
    one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming
    one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
    dactyl, digit
    a finger or toe in human beings or corresponding body part in other vertebrates
    either of a pair of poison fangs in the modified front pair of legs of the centipede
    hind limb, hindlimb
    a posterior appendage such as a leg or the homologous structure in other animals
    the front limb (or the homologous structure in other animals, such as a flipper or wing)
    the flat broad limb of aquatic animals specialized for swimming
    dorsal fin
    unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance
    pectoral fin
    either of a pair of fins situated just behind the head in fishes that help control the direction of movement
    pelvic fin, ventral fin
    either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate
    caudal fin, tail fin
    the tail of fishes and some other aquatic vertebrates
    a human limb; commonly used to refer to a whole limb but technically only the part of the limb between the knee and ankle
    the leg from the knee to foot
    a structure in animals that is similar to a human leg and used for locomotion
    the part of the leg between the hip and the knee
    a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb
    the arm from the elbow to the fingertips
    the part of the superior limb between the elbow and the wrist
    the fifth digit; the little finger or little toe
    any of the terminal members of the hand (sometimes excepting the thumb)
    one of the digits of the foot
    either of the two mouthparts used by arthropods to hold and bite food
    type of:
    external body part
    any body part visible externally
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