(sports) Abbreviation of Owen Sound.

Abbreviation of outsize (clothes for large people) / Abbreviation of oversize.

(UK) an Ordnance Survey map. / (software) Initialism of operating system. / Abbreviation of ordinary seaman.

(anatomy) An opening or entrance to a passage, particularly one at either end of the cervix, internal (to the uterus) or external (to the vagina).

(anatomy) Synonym of bone.

An osar or esker.

(rare) Alternative form of o's.

Used to form plurals of some Hebrew and Yiddish loanwords, usually ending in -a or -ah.

plural of O

(non-productive) Against; facing; a combining prefix found in verbs of Latin origin.