Definitions from Wiktionary (Os)

▸ noun:  The Ordnance Survey, official mapping agency in Great Britain (see also the noun below).
▸ noun:  (UK) An Ordnance Survey map.
▸ noun:  (anatomy) Synonym of bone.
▸ noun:  (anatomy, sometimes botany) An opening or entrance to a passage, particularly one at either end of the cervix, internal (to the uterus) or external (to the vagina).
▸ noun:  An osar or esker.
▸ noun:  (sports) Abbreviation of Owen Sound. [A placename]
▸ adjective:  Abbreviation of outsize (clothes for large people) [of an unusually large size]
▸ adjective:  Abbreviation of oversize. [Larger than normal]
▸ adjective:  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
▸ adjective:  (screenwriting) Abbreviation of offscreen; indicates a line of dialogue is spoken by someone not visible onscreen [Existing or happening outside the frame of the cinema or television screen]
▸ adverb:  (Australia, informal) Abbreviation of overseas. [Abroad.]
▸ noun:  (software) Initialism of operating system. [(computing, software) Software that is designed for controlling the allocation and the use of various hardware resources to tasks and remote terminals.]
▸ noun:  Initialism of ordinary seaman. [(nautical) The lowest grade of seaman in the merchant marine; the grade below able-bodied seaman.]
▸ noun:  Initialism of oppidan scholar.
▸ noun:  (rare) Alternative form of o's.

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