os

Other forms: ora; ossa; osar

Definitions of os
  1. noun
    a mouth or mouthlike opening
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    type of:
    opening, orifice, porta
    an aperture or hole that opens into a bodily cavity
  2. noun
    rigid connective tissue that makes up the skeleton of vertebrates
    synonyms: bone
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    types:
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    furcula
    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
    fishbone
    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
    centrum
    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
    ilium
    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
    ramus
    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
    metatarsal
    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
    phalanx
    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
    sacrum
    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
    manubrium
    the upper part of the breastbone
    xiphisternum, 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
    tooth
    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
    vertebra
    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
    modiolus
    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
    skull
    the bony skeleton of the head of vertebrates
    calvaria, skullcap
    the dome of the skull
    braincase, brainpan,