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O

[oh] /oʊ/
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
1125-1175
1125-75; Middle English < Old French < Latin ō
Can be confused
O, oh, owe.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for os.

o

/əʊ/
noun (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

O1

symbol
1.
(chem) oxygen
2.
a human blood type of the ABO group See universal donor
3.
(logic) a particular negative categorial proposition, such as some men are not married: often symbolized as SoP Compare A, E, I2
abbreviation
4.
(Austral, slang) offence
Word Origin
(for sense 3) from Latin (neg)o I deny

O2

/əʊ/
interjection
1.
a variant spelling of oh
2.
an exclamation introducing an invocation, entreaty, wish, etc: O 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
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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
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os. in Medicine

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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os. in Science
O  
The symbol for oxygen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for os.

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
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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Word Value for os

2
2
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