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[lahy-eys, -eyz] /ˈlaɪ eɪs, -eɪz/
noun, Biochemistry
any of various enzymes, as decarboxylase, that catalyze reactions involving the formation of or addition to a double bond.
Origin of lyase
1960-65; < Greek (ein) to loosen, dissolve (see lysis) + -ase Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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
Word Origin
C20: from Greek lusis a loosening + -ase
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
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lyase in Medicine

lyase ly·ase (lī'ās')
Any of a group of enzymes that catalyze the formation of double bonds by removing chemical groups from a substrate without hydrolysis or catalyze the addition of chemical groups to double bonds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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