1. 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).
2. a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address: cheerio; kiddo; neato; righto.
[perh. orig. the interjection O, appended to words as in def. 2; as a derivational suffix reinforced by clipped forms of words with -O- as a linking element (e.g., PHOTO, STEREO), by Rom nouns ending in o, and by personal nouns such as BIMBO and BOZO, of obscure orig.]

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Universalium. 2010.

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