OS'

Dictionary.com Unabridged

os

2 [os] .
noun, plural ora [awr-uh, ohr-uh] .
Anatomy, Zoology. a mouth or orifice of the body.

Origin:
1730–40; < Latin ōs mouth

os

3 [ohs] .
noun, plural osar [oh-sahr] .
Geology. an esker, especially when of great length.

Origin:
< Swedish ås (plural åsar) ridge

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.
3.
the exclamation “O.”

Origin:
1125–75; Middle English < Old French < Latin ō

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
o or O (əʊ)
 
n , pl o's, O's, 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 or O
 
n

O1
 
symbol for
1.  chem oxygen
2.  See universal donor a human blood type of the ABO group
3.  logic A E Compare I a particular negative categorial proposition, such as some men are not married: often symbolized as SoP
 
abbreviation for
4.  slang (Austral) offence
 
[(for sense 3) from Latin (neg)o I deny]

O2 (əʊ)
 
interj
1.  a variant spelling of oh
2.  an exclamation introducing an invocation, entreaty, wish, etc: O God!; O for the wings of a dove!

os1 (ɒs)
 
n , pl ossa
anatomy the technical name for bone
 
[C16: from Latin: bone; compare Greek osteon]

os2 (ɒs)
 
n , pl ora
anatomy, zoology a mouth or mouthlike part or opening
 
[C18: from Latin]

os3 (əʊs)
 
n , pl osar
another name for esker
 
[C19 osar (pl), from Swedish ås (sing) ridge]

Os
 
the chemical symbol for
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)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

o
interj. 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
Cite This Source
American Heritage
Medical Dictionary

o
The Greek letter omicron. Entries beginning with this character are alphabetized under omicron.

O 1

The symbol for the element oxygen.

O 2
abbr.
oculus

os 1 (ŏs)
n. pl. o·ra (ôr'ə)

  1. An opening into a hollow organ or canal.

  2. The oral cavity; mouth.

os 2 (ŏs)
n. pl. os·sa (ŏs'ə)
Bone.

Os
The symbol for the element osmium.

OS abbr.
Latin oculus sinister (left eye)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
O  
The symbol for oxygen.
Os  
The symbol for osmium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Slang Dictionary

OS

/O-S/
1. [Operating System] n. An abbreviation heavily used in email, occasionally in speech.
2. n. obs. On ITS, an output spy. See "OS and JEDGAR" in Appendix A.
American Heritage
Abbreviations & Acronyms
o
  1. Latin octarius (pint)

  2. octavo

  3. ohm

O
  1. old

  2. Oriental (as in personal ads, but usually A, Asian)

  3. out

  4. outstanding

Os
osmium
OS
  1. offscreen

  2. Old Saxon

  3. Old Style (calendar)

  4. operating system

  5. ordinary seaman

  6. out of stock

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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