OS (ora, osar, ossa)

Pronunciation (US):

(GB):

IPA (US):

Irregular inflected forms: ora    , osar    , ossa   

 Dictionary entry overview: What does OS mean? 

• OS (noun)
  The noun OS has 5 senses:

1. a mouth or mouthlike opening

2. a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known

3. (computer science) software that controls the execution of computer programs and may provide various services

4. the left eye

5. rigid connective tissue that makes up the skeleton of vertebrates

  Familiarity information: OS used as a noun is common.

 Dictionary entry details 

• OS (noun)

Sense 1

Meaning:

A mouth or mouthlike opening

Classified under:

Nouns denoting body parts

Hypernyms ("os" is a kind of...):

opening; orifice; porta (an aperture or hole that opens into a bodily cavity)

Sense 2

Meaning:

A hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known

Classified under:

Nouns denoting substances

Synonyms:

atomic number 76; Os; osmium

Hypernyms ("Os" is a kind of...):

metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

Sense 3

Meaning:

(computer science) software that controls the execution of computer programs and may provide various services

Classified under:

Nouns denoting communicative processes and contents

Synonyms:

operating system; OS

Hypernyms ("OS" is a kind of...):

computer software; package; software; software package; software program; software system ((computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory)

Meronyms (parts of "OS"):

executive program; supervisor; supervisory program (a program that controls the execution of other programs)

Domain category:

computer science; computing (the branch of engineering science that studies (with the aid of computers) computable processes and structures)

Hyponyms (each of the following is a kind of "OS"):

disk operating system; DOS (an operating system that is on a disk)

UNIX; UNIX operating system; UNIX system (trademark for a powerful operating system)

Windows ((trademark) an operating system with a graphical user interface)

Holonyms ("OS" is a part of...):

platform (the combination of a particular computer and a particular operating system)

Sense 4

Meaning:

The left eye

Classified under:

Nouns denoting body parts

Synonyms:

oculus sinister; OS

Hypernyms ("OS" is a kind of...):

eye; oculus; optic (the organ of sight)

Sense 5

Meaning:

Rigid connective tissue that makes up the skeleton of vertebrates

Classified under:

Nouns denoting body parts

Synonyms:

bone; os

Hypernyms ("os" is a kind 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)

Meronyms (parts of "os"):

bone cell (a cell that is part of a bone)

ground substance; intercellular substance; matrix (the body substance in which tissue cells are embedded)

bone marrow; marrow (the fatty network of connective tissue that fills the cavities of bones)

socket (a bony hollow into which a structure fits)

coronoid process; processus coronoideus (a sharp triangular process projecting from a bone)

condyle (a round bump on a bone where it forms a joint with another bone)

lamella (a thin membrane that is one of the calcified layers that form bones)

Meronyms (substance of "os"):

bone; osseous tissue (the porous calcified substance from which bones are made)

collagen (a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling)

Hyponyms (each of the following is a kind of "os"):

turbinal; turbinate; turbinate bone (any of the scrolled spongy bones of the nasal passages in man and other vertebrates)

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)

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)

furcula (a forked bone formed by the fusion of the clavicles of most birds)

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; cranium (the part of the skull that encloses the brain)

occiput (back part of the head or skull)

sinciput (the front part of the head or skull (including the forehead))

jaw (the part of the skull of a vertebrate that frames the mouth and holds the teeth)

vomer (thin trapezoidal bone of the skull forming the posterior and inferior parts of the nasal septum)

sutural bone; Wormian bone (any of the tiny soft bones found in the sutures between cranial bones)

marrowbone (a bone containing edible marrow; used especially in flavoring soup)

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)

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)

calcaneus; heelbone; os tarsi fibulare (the largest tarsal bone; forms the human heel)

phalanx (any of the bones of the fingers or toes)

bonelet; ossicle; ossiculum (a small bone; especially one in the middle ear)

nasal; nasal bone; os nasale (an elongated rectangular bone that forms the bridge of the nose)

metatarsal (any bone of the foot between the ankle and the toes)

metacarpal; metacarpal bone (any bone of the hand between the wrist and fingers)

membrane bone (any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull)

ramus (the posterior part of the mandible that is more or less vertical)

long bone; os longum (in limbs of vertebrate animals: a long cylindrical bone that contains marrow)

ischial bone; ischium; os ischii (one of the three sections of the hipbone; situated below the ilium)

ilium (the upper and widest of the three bones making up the hipbone)

hyoid; hyoid bone; os hyoideum (a U-shaped bone at the base of the tongue that supports the tongue muscles)

hipbone; innominate bone (large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis)

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)

Holonyms ("os" is a part of...):

endoskeleton (the internal skeleton; bony and cartilaginous structure (especially of vertebrates))

Holonyms ("os" is a substance of...):

horn (one of the bony outgrowths on the heads of certain ungulates)

 Context examples 

In a clinical trial, measuring the OS is one way to see how well a new treatment works.

(OS, NCI Dictionary)

It causes fibrovascular proliferation at the inferior ora serrata.

(Pars Planitis, NLM, Medical Subject Headings)

A condition in which the placenta covers or is within 1 cm of the cervical os.

(Placenta Previa, NCI Thesaurus)

Zone II extends centrifugally from the edge of zone I to the nasal ora serrata.

(Immature Retinal Vasculature in Zone 2, NICHD)

A condition in which the placenta is within 1 to 2 cm of the cervical os.

(Low-Lying Placenta, NCI Thesaurus)

A ring of tissue extending from the scleral spur to the ora serrata of the retina.

(Ciliary body, NLM, Medical Subject Headings)

A stretching and opening of the cervical os during childbirth in preparation for delivery of the baby; the diameter is measured in centimeters.

(Cervical Dilation, NCI Thesaurus)

A medical device with a small rubber cap that fits over the cervix to block sperm from entering the cervical os.

(Contraceptive Cap, NCI Thesaurus)

A mucus plug situated in the maternal cervical os during pregnancy that prevents entry of bacteria into the uterus.

(Cervical Mucus Plug, NCI Thesaurus)

A discharge of the mucus plug from the cervical os during cervical dilation in preparation for the labor and delivery of the baby.

(Passing of Mucus Plug, NCI Thesaurus)