os
noun
a bone.
os
1 American
[os]
/ ɒs /
noun
-
ossa
plural
os
2
American
[os]
/ ɒs /
noun
-
ora
plural
os
3
American
[ohs]
/ oʊs /
noun
-
osar
plural
Os
4
American
OS
5
American
o/s
6
American
-
(of the calendar) Old Style.
-
out of stock.
-
(in banking) outstanding.
O/S
7
American
O.S.
8
American
Or
o.s.
abbreviation
O.S.
9
American
OS
1
British
abbreviation
-
Old School
-
Old Style (method of reckoning dates)
-
Ordinary Seaman
-
(in Britain) Ordnance Survey
-
outsize
-
Old Saxon (language)
o.s.
2
British
abbreviation
-
out of stock
-
banking outstanding
Os
3
British
symbol
os
4
British
/ ɒs /
noun
os
5
British
/ ɒs /
noun
os
6
British
/ əʊs /
noun
Other Word Forms
Noun Inflected Forms
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
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
A new Longevity Preparedness Index from John Hancock and MIT AgeLab os based on a survey of over 1,300 adults and focused on eight areas such as finance, home, health and community.
From MarketWatch ● Dec. 12, 2025
She first broke through with 2016’s “Remonta,” an album she recorded with her former band Liniker e os Caramelows.
From Los Angeles Times ● Oct. 8, 2025
Ambos os programas são “fundamentais para entender a expansão agrícola no Brasil e as emissões de carbono do desmatamento na Amazônia,” diz Douglas Morton, especialista em sensoriamento remoto do Goddard Space Flight Center da NASA.
From Science Magazine ● May 26, 2022
Hours later, Kelly posts bail and os released from jail in Chicago.
From Seattle Times ● Aug. 18, 2021
Newton disliked infinitesimals, the little os in his fluxion equations that sometimes acted like zeros and sometimes like nonzero numbers.
From "Zero: The Biography of a Dangerous Idea" by Charles Seife
"The Dutch experience in my opinion offers a warning for Canada," Os cautioned.
From BBC ● May 15, 2026
On the personal side, Os is also relishing her relationship with Peso Pluma.
From Los Angeles Times ● Mar. 20, 2026
Os had plenty of examples of powerful pop divas to draw inspiration from.
From Los Angeles Times ● Mar. 20, 2026
Os, born Kenia Guadalupe Flores Osuna in Mazatlán, Sinaloa, has made an incredible leap from social media influencer to Latin Grammy-nominated pop star in under a decade.
From Los Angeles Times ● Mar. 20, 2026
It was a note, and it read: New CC was testing for undetected Ys, Os, Rs.
From "The Darkest Minds" by Alexandra Bracken
He was sitting in front of an aerial photograph of dry land projected onto a big screen at the OS headquarters in the port city of Southampton, southern England.
From Barron's ● Aug. 12, 2026
The prototype, running a proprietary OS with xAI technology, aligns with Musk’s “everything app” philosophy for his ventures.
From The Wall Street Journal ● Jul. 1, 2026
"You can see it today on OS maps in a yellow wash," says Kate.
From BBC ● Apr. 18, 2026
TiVo is now TiVo OS, an operating system marketed to makers of Smart TVs.
From Los Angeles Times ● Oct. 9, 2025
"Right. Well, the thing is, Pathfinder has an OS update process. So we can change the software to anything we want."
From "The Martian" by Andy Weir
O/S voice: Please can you just say it one more time?
From Washington Post ● Jul. 22, 2022
O/S voice: Can you just say it one more time?
From Washington Post ● Jul. 22, 2022
One of the issues pointed to with Chrome O/S is that you have no control over your local data, because you are using a “glorified browser,” but this is not the case.
From Forbes ● May 6, 2013
Photo courtesy of John Luke Venables I’ve been using Chrome O/S since the Chromium project was in beta, when I tested out the CR-48 for the Chromebook pilot testing program.
From Forbes ● May 6, 2013
He needed a group that knew the strengths and weaknesses of every major O/S to fulfill his mission.
From Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel by Winn Schwartau
Result: when French police once got a lead into the O.S., it swiftly collapsed.
From Time Magazine Archive
To the chagrin of the search committee, word has leaked out that Criswell favored O.S.
From Time Magazine Archive
D. sobrina O.S. is widely distributed in the United States and southern Canada, usually occurring in the Transitional and Upper Austral life-zones.
From Journal of Entomology and Zoology Volume 11, Number 4, December 1919 by Charles P. Alexander
The York coach-bill cited on the same page is in O.S.
From Notes and Queries, Number 05, December 1, 1849 by Various
But, in the night of the last of February O.S. while turning to windward with this view, the Guipuscoa, Hermiona, and Espranza were separated from the admiral.
When dealing with fluids other than serum the diluent is usually distilled water; whilst if the original substance is a solid the instructions would read: 1 gram o.s.
From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by J. W. H. (John William Henry) Eyre
He was courteously received on January 26 o.s., and was granted an audience by the House of Commons, but the decision had already been taken and his efforts were unavailing.
From History of Holland by George Edmundson
"WOW rita ora really ate this look up i am fully obsessed with it!!" wrote one fan on Twitter.
From Salon ● May 2, 2023
Is the museum presenting the history of cinema ora history of cinema?
From Los Angeles Times ● Sep. 7, 2021
Kia ora koutou – wherever this finds you around this glorious Commonwealth of ours!
From The Guardian ● Apr. 9, 2018
The party was able to push ahead with policies to foster the Maori language and a strategy to deliver services to Maori people called whanau ora, after the native word for family.
From BusinessWeek ● Nov. 29, 2011
The good old rule ora et labora is an extremely valuable precept, not only for the next world but also for this.
From Religion And Health by James J. (James Joseph) Walsh
The osar are similar to the kames of Scotland and the eschars of Ireland.
From The Gutenberg Webster's Unabridged Dictionary Section M, N, and O by Project Gutenberg
An I.N.S. photographer found McCarthy propped up in bed in blue pajamas, swathed in bandages from his tuberositas deltoidea to his ossa metacarpalia.
From Time Magazine Archive
Tarde venientibus ossa, he would have exclaimed if he had known Latin.
From Friars and Filipinos An Abridged Translation of Dr. Jose Rizal's Tagalog Novel, 'Noli Me Tangere.' by José Rizal
“Exultabunt Domino ossa humiliata” arose the chant again, as the cortège defiled within the church.
From Fordham's Feud by Bertram Mitford
Nom. senēs carnēs ossa Gen. senum carnium ossium Dat. senibus carnibus ossibus Acc. senēs carnēs ossa Voc. senēs carnēs ossa Abl. senibus carnibus ossibus 1.
From New Latin Grammar by Charles E. (Charles Edwin) Bennett
A variety of lords, squires, generals, ossa innominata followed, for whom the Chancellor cared perhaps about as much as I did.
From The Mirror Of Literature, Amusement, And Instruction Volume 17, No. 496, June 27, 1831 by Various
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.
