• (British) IPA: /ɒs/
  • (America) IPA: /ɑs/

os (plural ossa)

  1. (rare, medicine) Bone.
    • 1749, Henry Fielding, The History of Tom Jones, a Foundling. In Six Volumes, volume (please specify ), London: Printed by A[ndrew] Millar, […], OCLC 928184292 ↗:
      I was once, I remember, called to a patient who had received a violent contusion in his tibia, by which the exterior cutis was lacerated, so that there was a profuse sanguinary discharge; and the interior membranes were so divellicated, that the os or bone very plainly appeared through the aperture of the vulnus or wound.
    • 1891, Texas Medical Association, Transactions (volume 23, page 175)
      The instrument closed, as seen in Fig. 1, is then passed along the finger to the os, in and through the cervix up to the fundus of the uterus, which may be determined both by the distance and the resistance to the broad rounded head of the Capiat.
  • German: Os

os (plural ora)

  1. (rare) A mouth; an opening.
  2. In particular, either end of the cervix, internal (to the uterus) or external (to the vagina).


  1. An osar or esker.
  1. (rare) plural form of o. More commonly oes or o's.

  • IPA: /ˌoʊ ˈɛs/
Proper noun
  1. (sports) Abbreviation of Owen Sound#English|Owen Sound.

os (not comparable)

  1. Abbreviation of outsize#English|outsize (clothes for large people)
  2. Abbreviation of Old Style; a term used in English language historical studies to indicate that a date conforms to the Julian calendar instead of the modern Gregorian calendar
  3. (screenwriting) Abbreviation of offscreen#English|Offscreen; indicates a line of dialogue is spoken by someone not visible onscreen

os (plural oses or OSs)

  1. (UK) an Ordnance Survey map.
    We've got an OS of the Cuckmere area.
  2. (software) Initialism of operating system
    I've decided to install two different OSes on my new laptop.
  • Portuguese: SO

  1. plural form of O

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