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Definition of Bis-
1. Prefix. An occasional variant of bi- prefixed to roots beginning with a vowel, as in ''bisalternate'' ¹
2. Prefix. (chemistry) (obsolete) A variant of tri- used to indicate that the component that does ''not'' take the prefix occurs twice in the compound: a ''disoxide'' is of the form B2O ¹
3. Prefix. (mathematics chemistry) A variant of bi-, used for substitutions of two complex rather than simple units. ¹
¹ Source: wiktionary.com
Medical Definition of Bis-
1. 1. Prefix signifying two or twice. 2. In chemistry, used to denote, the presence of two identical but separated complex groups in one molecule. Compare: bi-, di-. Origin: L. (05 Mar 2000)