bis-

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Prefix

1. An occasional variant of [[bi-]] prefixed to roots beginning with a vowel, as in ''[[bisalternate]]''
2. {{lb|en|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)
3. {{lb|en|mathematics|chemistry}} A variant of [[di-]], used for substitutions of two complex rather than simple units.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.