any of various enzymes, as decarboxylase, that catalyze reactions involving the formation of or addition to a double bond.
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British Dictionary definitions for lyase
any enzyme that catalyses the separation of two parts of a molecule by the formation of a double bond between them
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012