member

If you're a member, you belong to a group or club. The late comedian Groucho Marx famously said, "I refuse to join any club that would have me as a member." Go figure.

When an object, like a plant or an element, is a member, it's also part of a group or class. A tiger, for example, is a member of the genus called Panthera, and it's also a member of the cat family. You're a member of the human species, and if you swim competitively, you're also a member of a swim team. The United States is a member, along with 192 other countries, of the United Nations. The Latin root of member is membrum, "part," and also "limb or part of the body."

Definitions of member
  1. noun
    anything that belongs to a set or class
    “snakes are members of the class Reptilia”
    members of the opposite sex”
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    type of:
    component, component part, constituent, moiety, part, portion
    something determined in relation to something that includes it
  2. noun
    one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
    “only members will be admitted”
    “a member of the faculty”
    “she was introduced to all the members of his family”
    synonyms: fellow member
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    Antonyms:
    nonmember
    a person who is not a member
    types:
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    Areopagite
    a member of the council of the Areopagus
    brother
    a male person who is a fellow member (of a fraternity or religion or other group)
    cabalist
    a member of a cabal
    charter member
    one of the original members when an organization was founded
    commissioner
    a member of a commission
    committee member
    a member of a committee
    council member, councillor
    a member of a council
    Conservative
    a member of a Conservative Party
    fellow
    a member of a learned society
    homeboy
    a fellow male member of a youth gang
    homegirl
    a fellow female member of a youth gang
    huddler
    a member of a huddle
    inductee
    a person inducted into an organization or social group
    joiner
    a person who likes to join groups
    kibbutznik
    a member of a kibbutz
    kolkhoznik
    a member of a kolkhoz
    board member
    a member of a governing board
    clan member, clansman, clanswoman
    a member of a clan
    club member
    someone who is a member of a club
    pledge
    someone accepted for membership but not yet fully admitted to the group
    Rosicrucian
    a member of a secret 17th-century society of philosophers and scholars versed in mystical and metaphysical and alchemical lore
    Rosicrucian
    a member of any of various organizations that subsequently derived from the 17th-century society
    Rotarian
    a member of a Rotary Club
    sister
    a female person who is a fellow member of a sorority or labor union or other group
    sodalist
    a member of a sodality
    tribesman
    someone who lives in a tribe
    committeeman
    a man who is a member of committee
    committeewoman
    a woman who is a member of a committee
    councilman
    a man who is a council member
    councilwoman
    a woman who is a council member
    director
    member of a board of directors
    Freemason, Mason
    a member of a widespread secret fraternal order pledged to mutual assistance and brotherly love
    regent, trustee
    members of a governing board
    Beguine
    (Roman Catholic Church) a member of a lay sisterhood (one of several founded in the Netherlands in the 12th and 13th centuries); though not taking religious vows the sisters followed an austere life
    type of:
    associate
    a person who joins with others in some activity or endeavor
  3. noun
    an organization that is a member of another organization (especially a state that belongs to a group of nations)
    “the library was a member of the interlibrary loan association”
    “Canada is a member of the United Nations”
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    type of:
    social unit, unit
    an organization regarded as part of a larger social group
  4. noun
    an external body part that projects from the body
    synonyms: appendage, extremity
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    types:
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    chelicera
    either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing
    mouthpart
    any part of the mouth of an insect or other arthropod especially one adapted to a specific way of feeding
    fang
    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
    parapodium
    one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing
    fin
    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
    limb
    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
    toxicognath
    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
    forelimb
    the front limb (or the homologous structure in other animals, such as a flipper or wing)
    flipper
    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
    leg
    a human limb; commonly used to refer to a whole limb but technically only the part of the limb between the knee and ankle
    crus
    the leg from the knee to foot
    leg
    a structure in animals that is similar to a human leg and used for locomotion
    thigh
    the part of the leg between the hip and the knee
    arm
    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
    cubitus
    the arm from the elbow to the fingertips
    forearm
    the part of the superior limb between the elbow and the wrist
    minimus
    the fifth digit; the little finger or little toe
    finger
    any of the terminal members of the hand (sometimes excepting the thumb)
    toe
    one of the digits of the foot
    mandible
    either of the two mouthparts used by arthropods to hold and bite food
    type of:
    external body part
    any body part visible externally
  5. noun
    the male organ of copulation (`member' is a euphemism)
    synonyms: penis
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    types:
    micropenis, microphallus
    an abnormally small penis
    type of:
    erectile organ
    an organ containing erectile tissue
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