noun, plural O's or Os; o's or os or oes.
1.
the fifteenth letter of the English alphabet, a vowel.
2.
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.
00:10
O
is always a great word to know.
So is quincunx. Does it mean:
| a scrap or morsel of food left at a meal. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
Dictionary.com Unabridged
noun
3.
the exclamation “O.”
Origin:
1125–75; Middle English < Old French < Latin ō
1125–75; Middle English < Old French < Latin ō
O
Symbol.
1.
the fifteenth in order or in a series.
2.
the Arabic cipher; zero.
3.
(sometimes lowercase) the medieval Roman numeral for 11. Compare Roman numerals.
4.
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.
5.
Chemistry, oxygen.
6.
Logic. particular negative.
O'
a prefix meaning “descendant,” in Irish family names: O'Brien; O'Connor.
Origin:
representing Irish ó descendant, Old Irish au
representing Irish ó descendant, Old Irish au
o-
1 Chemistry.
an abridgment of ortho-.
o-
2variant of ob- before m: omission.
o-
3variant of oo-: oidium.
-o-
the typical ending of the first element of compounds of Greek origin (as -i-, is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology: Franco-Italian; geography; seriocomic; speedometer.
-o
1.
2.
a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address: cheerio; kiddo; neato; righto.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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|
Link To O
Collins
World English Dictionary
o or O (əʊ) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —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 | |
| 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! |
| o- | |
| —prefix | |
| short for ortho- | |
| o' (ə) | |
| —prep | |
| informal, archaic or shortened form of of : a cup o' tea | |
| o' (ə) | |
| —prep | |
| informal, archaic or shortened form of of : a cup o' tea | |
| O'- | |
| —prefix | |
| (in surnames of Irish Gaelic origin) descendant of: O'Corrigan | |
| [from Irish Gaelic ó, ua descendant] | |
| -o | |
| —suffix | |
| forming informal and slang variants and abbreviations, esp of nouns: wino; lie doggo; Jacko | |
| [probably special use of | |
| -o- | |
| —connective vowel | |
| Compare -i- used to connect elements in a compound word: chromosome; filmography | |
| [from Greek, stem vowel of many nouns and adjectives in combination] | |
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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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
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.
O'
as a prefix in Irish names, from Ir. ó, ua (O.Ir. au) "descendant."
Online Etymology Dictionary, © 2010 Douglas Harper
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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
o- abbr.
ortho- (often italic)
-o-
Used as a connective to join word elements: acidophilic.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
| O
The symbol for oxygen. |
oxygen  (ŏk'sĭ-jən) Pronunciation Key
Symbol O A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. Atomic number 8; atomic weight 15.9994; melting point -218.4°C; boiling point -183.0°C; gas density at 0°C 1.429 grams per liter; valence 2. See Periodic Table. Our Living Language : In 1786, the French chemist Antoine Lavoisier coined a term for the element oxygen (oxygène in French). He used Greek words for the coinage: oxy- means "sharp," and -gen means "producing." Oxygen was called the "sharp-producing" element because it was thought to be essential for making acids. Lavoisier also coined the name of the element hydrogen, the "water-producing" element, in 1788. Soon after, in 1791, another French chemist, J. A. Chaptal, introduced the word nitrogen, the "niter-producing" element, referring to its discovery from an analysis of nitric acid. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
American Heritage
Abbreviations & Acronyms
o
|
O
|
O.
|
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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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences from the web
The intensification of the difference between rounded and unrounded e and o.
The predominant letter in the ending forms of this declension is o.
When the meaning of the name was no longer understood, it lost its prefix o.
The point of intersection, where the axes meet, is called the origin normally labeled o.
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