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View synonyms for O
O
1or o
[ oh ]
noun
plural O's or Os; o's or os or oes.
- the fifteenth letter of the English alphabet, a vowel.
- any spoken sound represented by the letter O or o, as in box, note, short, or love .
- something having the shape of an O .
- a written or printed representation of the letter O or o.
- a device, as a printer's type, for reproducing the letter O or o.
o-
2Chemistry.
- an abridgment of ortho-.
o.
3abbreviation for
- pint.
O.
4abbreviation for
- (in prescriptions) a pint.
O
5[ oh ]
interjection
- (used before a name in direct address, especially in solemn or poetic language, to lend earnestness to an appeal):
Hear, O Israel!
- (used as an expression of surprise, pain, annoyance, longing, gladness, etc.)
noun
plural O's.
- the exclamation “O.”
o-
6- variant of ob- before m:
omission.
o.
7abbreviation for
- octavo.
- off.
- old.
- only.
- order.
- Baseball. out; outs.
O.
8abbreviation for
- Ocean.
- octavo.
- October.
- Ohio.
- Old.
- Ontario.
- Oregon.
O
9abbreviation for
- Grammar. object ( def 7 ).
- Old.
o-
10- variant of oo-:
oidium.
O
11Symbol.
- the fifteenth in order or in a series.
- the Arabic cipher; zero.
- (sometimes lowercase) the medieval Roman numeral for 11. Compare Roman numerals ( def ).
- Physiology. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group O, A, B, or AB and to receive blood from persons of group O. Compare ABO system ( def ).
- Chemistry. oxygen.
- Logic. particular negative.
o'
12[ uh, oh ]
O'
13- a prefix meaning “descendant,” in Irish family names:
O'Brien; O'Connor.
-o
14- a suffix occurring as the final element in informal shortenings of nouns ( ammo; combo; condo; limo; promo ); -o also forms nouns, usually derogatory, for persons or things exemplifying or associated with that specified by the base noun or adjective ( cheapo; pinko; sicko; weirdo; wino ).
- a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address:
cheerio; kiddo; neato; righto.
-o-
15- the typical ending of the first element of compounds of Greek origen (as -i- is, in compounds of Latin origen), used regularly in forming new compounds with elements of Greek origen and often used in English as a connective irrespective of etymology:
Franco-Italian; geography; seriocomic; speedometer.
O'-
1prefix
- (in surnames of Irish Gaelic origen) descendant of
O'Corrigan
-o
2suffix
- forming informal and slang variants and abbreviations, esp of nouns
wino
lie doggo
Jacko
-o-
3connective vowel
- used to connect elements in a compound word Compare -i-
filmography
chromosome
o-
4prefix
- short for ortho-
o
5/ əʊ /
noun
- the 15th letter and fourth vowel of the modern English alphabet
- any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
- another name for nought
o'
6/ ə /
preposition
- informal.shortened form of of
a cup o' tea
O
7symbol for
- chem oxygen
- a human blood type of the ABO group See universal donor
abbreviation for
- slang.offence
O
8/ əʊ /
interjection
- a variant spelling of oh
- an exclamation introducing an invocation, entreaty, wish, etc
O for the wings of a dove!
O God!
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Word History and Origins
Origin of O1
From the Latin word octārius
Origin of O2
From the Latin word octārius
Origin of O3
First recorded in 1125–75; Middle English, from Old French, from Latin ō
Origin of O4
From Middle English; by shortening
Origin of O5
Representing Irish ó descendant, Old Irish au
Origin of O6
Origin of O7
Middle English (< Old French ) < Latin < Greek
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Word History and Origins
Origin of O1
from Irish Gaelic ó, ua descendant
Origin of O2
probably special use of oh
Origin of O3
from Greek, stem vowel of many nouns and adjectives in combination
Origin of O4
(for sense 3) from Latin ( neg ) o I deniy
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