bis-
释义（英文）
前缀 Prefix
- An occasional variant of bi- prefixed to roots beginning with a vowel, as in bisalternate
- (chemistry, obsolete) A variant of di- used to indicate that the component that does not take the prefix occurs twice in the compound: a bisoxide is of the form B2O (cf. dioxide for XO2)
- (mathematics, chemistry) A variant of di-, used for substitutions of two complex rather than simple units.