lyase

lyase

[lahy-eys, -eyz]
noun Biochemistry.
any of various enzymes, as decarboxylase, that catalyze reactions involving the formation of or addition to a double bond.

Origin:
1960–65; < Greek (ein) to loosen, dissolve (see lysis) + -ase

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World English Dictionary
lyase (ˈlaɪeɪz)
 
n
any enzyme that catalyses the separation of two parts of a molecule by the formation of a double bond between them
 
[C20: from Greek lusis a loosening + -ase]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

lyase ly·ase (lī'ās')
n.
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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Encyclopedia Britannica
Encyclopedia

lyase

in physiology, any member of a class of enzymes that catalyze the addition or removal of the elements of water (hydrogen, oxygen), ammonia (nitrogen, hydrogen), or carbon dioxide (carbon, oxygen) at double bonds. For example, decarboxylases remove carbon dioxide from amino acids and dehydrases remove water. See enzyme.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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