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
You could talk to him about os and argos, suet and grease, croteys, fewmets and fiants, but he only looked polite.
From "The Once and Future King" by T. H. White
"The Dutch experience in my opinion offers a warning for Canada," Os cautioned.
From BBC ● May 15, 2026
“I want to grow more internationally with this album,” says Os.
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
Os reveals that she and Morrison worked on a third song that they’re still putting the finishing touches on.
From Los Angeles Times ● Mar. 20, 2026
Funny thing is I knew what the shirt said because of the two Os in the middle.
From "The Truth as Told by Mason Buttle" by Leslie Connor
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
"We don't know if he's still alive," his aunt Francesca told the BBC World Service's OS programme.
From BBC ● Jan. 2, 2026
The Navy project, Ship OS, will initially focus on submarines, aiming to improve supply chain management and predict component needs.
From Barron's ● Dec. 10, 2025
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: Just do one take with “heinous” and without the “wonderful people.”
From Washington Post ● Jul. 22, 2022
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
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
It is the O/S that allows the computer to execute its commands.
From Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel by Schwartau, Winn
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
Winnifrith read the prayers, Colonel Crawford the lessons, and the Rev. O.S.
From With our Fighting Men The story of their faith, courage, endurance in the Great War by Sellers, William Edward
The York coach-bill cited on the same page is in O.S.
From Notes and Queries, Number 05, December 1, 1849 by Various
Horace was her youngest child, and was born in Arlington Street, on the 24th of September, 1717, O.S.
From The Wits and Beaux of Society Volume 2 by Wharton, Philip
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 Edmundson, George
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 Eyre, J. W. H. (John William Henry)
"WOW rita ora really ate this look up i am fully obsessed with it!!" wrote one fan on Twitter.
From Salon ● May 2, 2023
Mask-wearing is encouraged, though not yet required outdoors, and all attendees will be required to show proof of full vaccination ora negative COVID-19 test taken no more than 48 hours prior to entering the event.
From Los Angeles Times ● Aug. 19, 2021
“Kia ora from New Zealand,” chirps John Palethorpe.
From The Guardian ● Dec. 11, 2019
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
Ora pro nobis! the wave must rock our sleep; Ora, Mater, ora!
From The Story of the Hymns and Tunes by Brown, Theron
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
The bones which support the ventral or belly fins are called the ossa pelvis.
From The Book of Household Management by Beeton, Mrs. (Isabella Mary)
Since Michelangelo's great paintings were at Rome the Florentines copied chiefly his statues, devoting themselves principally, as Lanzi says, to ostentatiously showing "magna ossa lacertosque."
From Michelangelo by Rolland, Romain
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 Bennett, Charles E. (Charles Edwin)
Already at his entrance in Halle, one of the professors greeted the nineteen-year-old giant with the words, 'Quanta ossa!
From American Lutheranism Volume 1: Early History of American Lutheranism and The Tennessee Synod by Bente, F. (Friedrich)
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.
