os

1
[ os ]
/ ɒs /

noun, plural os·sa [os-uh]. /ˈɒs ə/.

Anatomy, Zoology. a bone.

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Origin of os

1
Borrowed into English from Latin around 1540–50

Definition for os (2 of 9)

os2
[ os ]
/ ɒs /

noun, plural o·ra [awr-uh, ohr-uh]. /ˈɔr ə, ˈoʊr ə/.

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

Origin of os

2
First recorded in 1730–40, os is from the Latin word ōs mouth

Definition for os (3 of 9)

os3
[ ohs ]
/ oʊs /

noun, plural o·sar [oh-sahr]. /ˈoʊ sɑr/.

Geology. an esker, especially when of great length.

Origin of os

3
<Swedish ås (plural åsar) ridge

Definition for os (4 of 9)

Os

Symbol, Chemistry. osmium.

Definition for os (5 of 9)

OS

abbreviation

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

Definition for os (6 of 9)

o/s

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

Definition for os (7 of 9)

O/S

(of the calendar) Old Style.

Definition for os (8 of 9)

O.S.1

or o.s.


(in prescriptions) the left eye.

Origin of O.S.

1
From Latin oculus sinister

Definition for os (9 of 9)

O.S.2

abbreviation

Old Saxon. Also OS
(of the calendar) Old Style (def. 2).
ordinary seaman. Also o.s.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for os (1 of 6)

os1
/ (ɒs) /

noun plural ossa (ˈɒsə)

anatomy the technical name for bone

Word Origin for os

C16: from Latin: bone; compare Greek osteon

British Dictionary definitions for os (2 of 6)

os2
/ (ɒs) /

noun plural ora (ˈɔːrə)

anatomy zoology a mouth or mouthlike part or opening

Word Origin for os

C18: from Latin

British Dictionary definitions for os (3 of 6)

os3
/ (əʊs) /

noun plural osar (ˈəʊsɑː)

another name for esker

Word Origin for os

C19 osar (pl), from Swedish ås (sing) ridge

British Dictionary definitions for os (4 of 6)

Os

the chemical symbol for

osmium

British Dictionary definitions for os (5 of 6)

OS

abbreviation for

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

British Dictionary definitions for os (6 of 6)

o.s.

OS or O/S


abbreviation for

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

Medical definitions for os (1 of 4)

os 11
[ ŏs ]

n. pl. o•ra (ôrə)

An opening into a hollow organ or canal.
The oral cavity; mouth.

Medical definitions for os (2 of 4)

os 22
[ ŏs ]

n. pl. os•sa (ŏsə)

Bone.

Medical definitions for os (3 of 4)

Os

The symbol for the elementosmium

Medical definitions for os (4 of 4)

OS

abbr.

oculus sinister (left eye)
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for os

Os

The symbol for osmium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.