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Collins Concise English Dictionary © HarperCollins Publishers:: -o- connective vowel - used to connect elements in a compound word: chromosome, filmography
Etymology: from Greek, stem vowel of many nouns and adjectives in combination WordReference Random House Learner's Dictionary of American English © 2024O, o /oʊ/USA pronunciation n. [countable], pl. O's or Os; o's or os or oes. - the 15th letter of the English alphabet, a vowel.
O /oʊ/USA pronunciation interj., n., pl. O's. interj. - (used before a person's name when speaking to that person directly, esp. in solemn or poetic language):Hear, O Great King, the plea of your subjects.
- (used to express strong emotion, such as surprise, pain, annoyance, desire, or gladness):"O, no, they're back!'' "O, now you want to go.''
n. [countable] - the exclamation "O'':A series of O's occurred in his speech to the king.
O, Symbol.- the 15th in order or in a series.
- the Arabic numeral zero;
cipher. - Physiologya major blood group.
- Chemistryoxygen.
-o, suffix. - -o is used as the final element in certain nouns that are shortened from longer nouns: ammo (from "ammunition'');
combo (from "combination''); promo (from "promotion''). - -o is also attached to certain adjectives and nouns to form nouns that have an unfavorable or insulting meaning:weird + -o → weirdo (= a very weird person);wine + -o → wino (= someone who drinks too much wine).
- -o is attached to certain nouns and adjectives to form informal nouns or adjectives;
these are often used when speaking directly to another:kid + -o → kiddo (= a kid or person);neat + -o → neato (= an informal use of "neat'');right + -o → righto (= an informal use of "right''). O., an abbreviation of:- October.
- Ohio.
WordReference Random House Unabridged Dictionary of American English © 2024O, o (ō),USA pronunciation n., pl. 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 &sanserifO.
- 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 (ō),USA pronunciation interj., n., pl. O's. interj. - (used before a name in direct address, esp. in solemn or poetic language, to lend earnestness to an appeal):Hear, O Israel!
- Grammar(used as an expression of surprise, pain, annoyance, longing, gladness, etc.)
n. - the exclamation "O.''
- Latin ō
- Old French
- Middle English 1125–75
O, - Old.
- [Gram.]object.
O, Symbol.- the fifteenth in order or in a series.
- the Arabic cipher;
zero. - (sometimes l.c.) the medieval Roman numeral for 11. Cf. Roman numerals.
- Physiologya 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. Cf. ABO system.
- Chemistryoxygen.
- Philosophy[Logic.]See particular negative.
o' (ə, ō),USA pronunciation prep. - an abbreviated form of of, as in o'clock or will-o'-the-wisp.
- an abbreviated form of on.
- by shortening. Middle English
O', - a prefix meaning "descendant,'' in Irish family names:O'Brien; O'Connor.
- representing Irish ó descendant, Old Irish au
o-1 ,[Chem.]- Chemistryan abridgment of ortho-.
o-2 ,- var. of ob- before m: omission.
o-3 ,- var. 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; seriocomic;speedometer.Cf. -i-.
- Greek
- Latin
- Old French)
- Middle English (
-o, - 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; neato;righto.
- as a derivational suffix reinforced by clipped forms of words with -o- as a linking element (e.g., photo, stereo), by Romance nouns ending in o, and by personal nouns such as bimbo and bozo, of obscure origin, originally perh. origin, originally the interjection O, appended to words as in def. 2
O., - Ocean.
- Drugs(in prescriptions) a pint.
- octavo.
- October.
- Ohio.
- Old.
- Ontario.
- Oregon.
o., - Weights and Measurespint.
- octavo.
- off.
- old.
- only.
- order.
- Sport[Baseball.]out;
outs.
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