bis-

  1. Prefix.  An occasional variant of bi- prefixed to roots beginning with a vowel, as in ''bisalternate''.
  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.
  3. Prefix.  (mathematics, chemistry) A variant of bi-, used for substitutions of two complex rather than simple units. .

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This entry was last updated on RefTopia from its source on 3/20/2012.