hydro-lyase

[hī′drō-līās′, -āz′]
n.
  1. Any of a class of lyase enzymes that catalyze the removal of water from a molecule leading to formation of new double bonds within the affected molecule.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.