Primary Meanings of os

a mouth or mouthlike opening
rigid connective tissue that makes up the skeleton of vertebrates
Full Definitions of os

n a mouth or mouthlike opening

Type of:
opening, orifice, porta
an aperture or hole that opens into a bodily cavity

n rigid connective tissue that makes up the skeleton of vertebrates

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a forked bone formed by the fusion of the clavicles of most birds
splint bone
a rudimentary metacarpal or metatarsal bone on either side of the cannon bone in the leg of a horse or related animal
fetter bone, pastern
the part between the fetlock and the hoof
cannon bone
greatly developed metatarsal or metacarpal bone in the shank or cannon part of the leg in hoofed mammals
a bone of a fish
anklebone, astragal, astragalus, talus
the bone in the ankle that articulates with the leg bones to form the ankle joint
bare bone
bone stripped of flesh
cuboid bone
the cube shaped bone on the outer side of the tarsus
carpal, carpal bone, wrist bone
any of the eight small bones of the wrist of primates
cartilage bone
any bone that develops within cartilage rather than a fibrous tissue
the main body of a vertebra
cheekbone, jugal bone, malar, malar bone, os zygomaticum, zygomatic, zygomatic bone
the arch of bone beneath the eye that forms the prominence of the cheek
clavicle, collarbone
bone linking the scapula and sternum
coccyx, tail bone
the end of the vertebral column in humans and tailless apes
dentin, dentine
bone (calcified tissue) surrounding the pulp cavity of a tooth
ethmoid, ethmoid bone
one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity
calcaneus, heelbone, os tarsi fibulare
the largest tarsal bone; forms the human heel
hipbone, innominate bone
large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis
hyoid, hyoid bone, os hyoideum
a U-shaped bone at the base of the tongue that supports the tongue muscles
the upper and widest of the three bones making up the hipbone
ischial bone, ischium, os ischii
one of the three sections of the hipbone; situated below the ilium
long bone, os longum
in limbs of vertebrate animals: a long cylindrical bone that contains marrow
the posterior part of the mandible that is more or less vertical
membrane bone
any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull
metacarpal, metacarpal bone
any bone of the hand between the wrist and fingers
any bone of the foot between the ankle and the toes
nasal, nasal bone, os nasale
an elongated rectangular bone that forms the bridge of the nose
bonelet, ossicle, ossiculum
a small bone; especially one in the middle ear
os palatinum, palatine, palatine bone
either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits
any of the bones of the fingers or toes
os pubis, pubic bone, pubis
one of the three sections of the hipbone; together these two bones form the front of the pelvis
costa, rib
any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates)
round bone
bones that are round in shape
wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx
scapula, shoulder blade, shoulder bone
either of two flat triangular bones one on each side of the shoulder in human beings
os sesamoideum, sesamoid, sesamoid bone
any of several small round bones formed in a tendon where it passes over a joint
os breve, short bone
a bone that is of approximately equal dimension in all directions
os sphenoidale, sphenoid, sphenoid bone
butterfly-shaped bone at the base of the skull
breastbone, sternum
the flat bone that articulates with the clavicles and the first seven pairs of ribs
corpus sternum, gladiolus
the large central part of the breastbone
the upper part of the breastbone
xiphoid process
smallest of the three parts of the breastbone; articulates with the corpus sternum and the seventh rib
tarsal, tarsal bone
any bone of the tarsus
os temporale, temporal bone
a thick bone forming the side of the human cranium and encasing the inner ear
hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
turbinal, turbinate, turbinate bone
any of the scrolled spongy bones of the nasal passages in man and other vertebrates
tympanic bone
the bone enclosing the middle ear
one of the bony segments of the spinal column
arcus zygomaticus, zygoma, zygomatic arch
the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone
the central conical bony pillar of the cochlea
lacrimal bone
small fragile bone making up part of the front inner walls of each eye socket and providing room for the passage of the lacrimal ducts
the bony skeleton of the head of vertebrates
calvaria, skullcap
the dome of the skull
braincase, brainpan, cranium
the part of the skull that encloses the brain
back part of the head or skull
the front part of the head or skull (including the forehead)
the part of the skull of a vertebrate that frames the mouth and holds the teeth
thin trapezoidal bone of the skull forming the posterior and inferior parts of the nasal septum
Wormian bone, sutural bone
any of the tiny soft bones found in the sutures between cranial bones
a bone containing edible marrow; used especially in flavoring soup
hollow or grooved tooth of a venomous snake; used to inject its poison
a long pointed tooth specialized for fighting or digging; especially in an elephant or walrus or hog
the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta
wishbone, wishing bone
the furcula of a domestic fowl
nasal concha
one of several turbinate bones in the nasal cavity
navicular, os scaphoideum, scaphoid bone
the largest wrist bone on the thumb side
lunate bone, os lunatum, semilunar bone
one of the eight small wrist bones
cuneiform bone, os triquetrum, pyramidal bone, triquetral, triquetral bone
a wrist bone that articulates with the pisiform and hamate and lunate bones
os pisiforme, pisiform, pisiform bone
a small wrist bone that articulates only with the triquetral
os trapezium, trapezium, trapezium bone
the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
os trapezoideum, trapezoid, trapezoid bone
the wrist bone between the trapezium and the capitate bones
capitate, capitate bone, os capitatum
the wrist bone with a rounded head shape that articulates with the 3rd metacarpus
hamate, hamate bone, os hamatum, unciform bone
the wrist bone in line with the 4th and 5th fingers
jawbone, jowl, lower jaw, lower jawbone, mandible, mandibula, mandibular bone, submaxilla
the jaw in vertebrates that is hinged to open the mouth
auditory ossicle
ossicles of the middle ear that transmit acoustic vibrations from the eardrum to the inner ear
kneecap, kneepan, patella
a small flat triangular bone in front of the knee that protects the knee joint
chopper, pearly
informal terms for a human `tooth'
carnassial tooth
the last upper premolar and first lower molar teeth of a carnivore; having sharp edges for cutting flesh
maxilla, maxillary, upper jaw, upper jawbone
the jaw in vertebrates that is fused to the cranium
anterior, front tooth
a tooth situated at the front of the mouth
back tooth, posterior
a tooth situated at the back of the mouth
malposed tooth
a tooth that has grown in a faulty position
adult tooth, permanent tooth
any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age
baby tooth, deciduous tooth, milk tooth, primary tooth
one of the first temporary teeth of a young mammal (one of 20 in children)
canine, canine tooth, cuspid, dogtooth, eye tooth, eyetooth
one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars
bicuspid, premolar
a tooth having two cusps or points; located between the incisors and the molars
a tooth for cutting or gnawing; located in the front of the mouth in both jaws
grinder, molar
grinding tooth with a broad crown; located behind the premolars
forehead, frontal bone, os frontale
the large cranial bone forming the front part of the cranium: includes the upper part of the orbits
parietal bone
either of two skull bones between the frontal and occipital bones and forming the top and sides of the cranium
occipital bone
a saucer-shaped membrane bone that forms the back of the skull
a jaw
cervical vertebra, neck bone
one of 7 vertebrae in the human spine located in the neck region
dorsal vertebra, thoracic vertebra
one of 12 vertebrae in the human vertebral column; thoracic vertebrae extend from the seventh cervical vertebra down to the first lumbar vertebra
lumbar vertebra
one of 5 vertebrae in the human vertebral column; lumbar vertebrae extend from the twelfth thoracic vertebra down to the sacral vertebrae
sacral vertebra
one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum
caudal vertebra, coccygeal vertebra
one of 4 vertebrae in the human coccyx
true rib
one of the first seven ribs in a human being which attach to the sternum
the end of a long bone; initially separated from the main bone by a layer of cartilage that eventually ossifies so the parts become fused
diaphysis, shaft
the main (mid) section of a long bone
arm bone
a bone in the arm
leg bone
a bone of the leg
Type of:
connective tissue
tissue of mesodermal origin consisting of e.g. collagen fibroblasts and fatty cells; supports organs and fills spaces between them and forms tendons and ligaments

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