Involving two molecules, as in a b. reaction.
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bi·mo·lec·u·lar .bī-mə-'lek-yə-lər adj
1) relating to or formed from two molecules
2) being two molecules thick
bi·mo·lec·u·lar·ly adv
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bi·mo·lec·u·lar (bi″mo-lekґu-lər) relating to or formed from two molecules.Medical dictionary. 2011.