Meaning of ligase

li•gase

Pronunciation: (lī'gās, -gāz), [key]
— n. Biochem.
  1. any of a class of enzymes that catalyze the joining of two molecules by formation of a covalent bond accompanied by the hydrolysis of ATP.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.