os

1
[os]

Origin of os

1
Borrowed into English from Latin around 1540–50

os

2
[os]
noun, plural o·ra [awr-uh, ohr-uh] /ˈɔr ə, ˈoʊr ə/.
  1. 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

os

3
[ohs]
noun, plural o·sar [oh-sahr] /ˈoʊ sɑr/.
  1. Geology. an esker, especially when of great length.

Origin of os

3
< Swedish ås (plural åsar) ridge

Os

  1. Symbol, Chemistry. osmium.

OS

  1. Old Saxon.
  2. Computers. operating system.

O, o

[oh]
noun, plural O's or Os; o's or os or oes.
  1. the fifteenth letter of the English alphabet, a vowel.
  2. any spoken sound represented by the letter O or o, as in box, note, short, or love.
  3. something having the shape of an O.
  4. a written or printed representation of the letter O or o.
  5. a device, as a printer's type, for reproducing the letter O or o.

O

[oh]
interjection
  1. (used before a name in direct address, especially in solemn or poetic language, to lend earnestness to an appeal): Hear, O Israel!
  2. (used as an expression of surprise, pain, annoyance, longing, gladness, etc.)
noun, plural O's.
  1. the exclamation “O.”

Origin of O

1125–75; Middle English < Old French < Latin ō
Can be confusedO oh owe

o/s

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

O/S

  1. (of the calendar) Old Style.

O.S.

1

or o.s.

  1. (in prescriptions) the left eye.

Origin of O.S.

1
From the Latin word oculus sinister

O.S.

2
  1. Old Saxon.
  2. Old School.
  3. Old series.
  4. (of the calendar) Old Style.
  5. Also o.s. ordinary seaman.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for os

os

1
noun plural ossa (ˈɒsə)
  1. anatomy the technical name for bone

Word Origin for os

C16: from Latin: bone; compare Greek osteon

os

2
noun plural ora (ˈɔːrə)
  1. anatomy zoology a mouth or mouthlike part or opening

Word Origin for os

C18: from Latin

os

3
noun plural osar (ˈəʊsɑː)
  1. another name for esker

Word Origin for os

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

Os

the chemical symbol for
  1. osmium

OS

abbreviation for
  1. Old School
  2. Old Style (method of reckoning dates)
  3. Ordinary Seaman
  4. (in Britain) Ordnance Survey
  5. outsize
  6. Old Saxon (language)

o

O

noun plural o's, O's or Os
  1. the 15th letter and fourth vowel of the modern English alphabet
  2. any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
  3. another name for nought

o.s.

OS or O/S

abbreviation for
  1. out of stock
  2. banking outstanding

O

1
symbol for
  1. chem oxygen
  2. a human blood type of the ABO groupSee universal donor
  3. logic a particular negative categorial proposition, such as some men are not married: often symbolized as SoPCompare A, E, I 2
abbreviation for
  1. Australian slang offence

Word Origin for O

(for sense 3) from Latin (neg) o I deny

O

2
interjection
  1. a variant spelling of oh
  2. an exclamation introducing an invocation, entreaty, wish, etcO God!; O for the wings of a dove!
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

Word Origin and History for os

o

interjection of fear, surprise, admiration, etc.; see oh.

O

blood type, 1926, originally "zero," denoting absence of A and B agglutinogens.

Online Etymology Dictionary, © 2010 Douglas Harper

os in Medicine

Os

  1. The symbol for the elementosmium

OS

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

os in Science

Os

  1. The symbol for osmium.

O

  1. The symbol for oxygen.

osmium

[ŏzmē-əm]
Os
  1. A hard, brittle, bluish-white metallic element that is the densest naturally occurring element. It is used to make very hard alloys for fountain pen points, electrical contacts, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.