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View synonyms for os
os
1[ os ]
noun
, plural os·sa [os, -, uh].
- Anatomy, Zoology. a bone.
O.S.
2or o.s.
abbreviation for
- (in prescriptions) the left eye.
os
3[ os ]
noun
, plural o·ra [awr, -, uh, ohr, -, uh].
- Anatomy, Zoology. a mouth or orifice of the body.
O.S.
4abbreviation for
- Old Saxon ( def ). Also OS
- (of the calendar) Old Style ( def 2 ).
- ordinary seaman. Also o.s.
os
5[ ohs ]
noun
, plural o·sar [oh, -sahr].
- Geology. an esker, especially when of great length.
Os
6- Symbol, Chemistry. osmium.
OS
7abbreviation for
- Old Saxon ( def ). Also O.S.
- Computers. operating system ( def ).
o/s
8- (of the calendar) Old Style.
- out of stock.
- (in banking) outstanding.
O/S
9- (of the calendar) Old Style.
Os
2the chemical symbol for
- osmium
o.s.
3abbreviation for
- out of stock
- banking outstanding
OS
5abbreviation for
- Old School
- Old Style (method of reckoning dates)
- Ordinary Seaman
- (in Britain) Ordnance Survey
- outsize
- Old Saxon (language)
os
6/ ɒs /
noun
- anatomy zoology a mouth or mouthlike part or opening
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Word History and Origins
Origin of os1
First recorded in 1540–50; from Latin os (inflectional stem oss- ) “bone”
Origin of os2
From Latin oculus sinister
Origin of os3
First recorded in 1730–40; from Latin ōs (inflectional stem ōr- ) “mouth”
Origin of os4
First recorded in 1840–50 as osar (plural); from Swedish ås (plural åsar ) “ridge (of a hill),” from Old Norse áss “thick pole or main beam; rocky ridge”
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Word History and Origins
Origin of os1
C19 osar (pl), from Swedish ås (sing) ridge
Origin of os2
C16: from Latin: bone; compare Greek osteon
Origin of os3
C18: from Latin
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