Dictionary![]() ![]() biPronunciation: (bī), [key] —adj., n., —pl. bis, bi's. Slang.bisexual. BI—pl. BI's. built-in. Bi—Symbol, Chem. bismuth. bi-a combining form meaning “twice,” “two,” used in the formation of compound words: bifacial; bifarious. Cf. bin-. bi-var. of bio-, esp. before a vowel: biopsy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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