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plural of O.

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os

os

noun

a bone.
Os

Os

osmium.
OS

OS

abbreviation

Old Saxon. Also O.S.
o/s

o/s

(of the calendar) Old Style.
O/S

O/S

(of the calendar) Old Style.
O.S.

O.S.

abbreviation

(in prescriptions) the left eye.
o.s.

o.s.

abbreviation

out of stock

Synonyms

os

¹ American

[os] / ɒs /

noun

Anatomy, Zoology. a bone.

os ² American

[os] / ɒs /

noun

Anatomy, Zoology. a mouth or orifice of the body.

os ³ American

[ohs] / oʊs /

noun

Geology. an esker, especially when of great length.

Os ⁴ American

Symbol, Chemistry. osmium.

OS ⁵ American

abbreviation

Old Saxon. Also O.S.
Computers. operating system.

o/s ⁶ American

(of the calendar) Old Style.
out of stock.
(in banking) outstanding.

O/S ⁷ American

(of the calendar) Old Style.

O.S. ⁸ American

Or o.s.

abbreviation

(in prescriptions) the left eye.

O.S. ⁹ American

abbreviation

Old Saxon. Also OS
(of the calendar) Old Style.
ordinary seaman. Also o.s.

OS ¹ British

abbreviation

Old School
Old Style (method of reckoning dates)
Ordinary Seaman
(in Britain) Ordnance Survey
outsize
Old Saxon (language)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

o.s. ² British

abbreviation

out of stock
banking outstanding

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Os ³ British

symbol

osmium

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

os ⁴ British

/ ɒs /

noun

anatomy the technical name for bone

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

os ⁵ British

/ ɒs /

noun

anatomy zoology a mouth or mouthlike part or opening

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

os ⁶ British

/ əʊs /

noun

another name for esker

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Inflected Forms

noun

Etymology

Origin of os¹

First recorded in 1540–50; from Latin os (inflectional stem oss- ) “bone”

Origin of os²

First recorded in 1730–40; from Latin ōs (inflectional stem ōr- ) “mouth”

Origin of os³

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”

Origin of O.S.⁸

From Latin oculus sinister

Vocabulary lists containing os

Scrabble: Two-Letter Words

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.