from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of many classes of enzyme that catalyze the breaking of a specific form of bond
Greek lūein, to loosen; see leu- in Indo-European roots + -ase.(American Heritage® Dictionary of the English Language, Fourth Edition)