os
1[ os ]
/ ɒs /
Save This Word!
noun, plural os·sa [os-uh]. /ˈɒs ə/.
Anatomy, Zoology. a bone.
QUIZZES
THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?
Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
Question 1 of 8
Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
Origin of os
1Borrowed 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
2First 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)
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.
abbreviation
(in prescriptions) the left eye.
Origin of O.S.
1From Latin oculus sinister
Definition for os (9 of 9)
O.S.2
abbreviation
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for os
British Dictionary definitions for os (1 of 6)
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)
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 (ôr′ə)
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 (ŏs′ə)
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.