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WordReference Random House Unabridged Dictionary of American English © 2024os1 (os),USA pronunciation n., pl. os•sa (os′ə).USA pronunciation - Anatomy, Zoologya bone.
os2 (os),USA pronunciation n., pl. o•ra (ôr′ə, ōr′ə).USA pronunciation - Anatomy, Zoologya mouth or orifice of the body.
os3 (ōs),USA pronunciation n., pl. o•sar (ō′sär).USA pronunciation - Geologyan esker, esp. when of great length.
- Swedish ås (plural åsar ) ridge
- Language VarietiesOld Saxon.
- Computingoperating system.
Os, - Chemistry[Symbol, Chem.]osmium.
O/S, - Time, (of the calendar) Old Style.
o/s, - Time, (of the calendar) Old Style.
- out of stock.
- Business(in banking) outstanding.
O.S., (in prescriptions) the left eye. - Language VarietiesOld Saxon.
- Old School.
- Old series.
- Time(of the calendar) Old Style.
- Naval TermsSee ordinary seaman.
o.s., (in prescriptions) the left eye. - Naval TermsSee ordinary seaman.
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