/ Dictionary / Index A acetylcholinesterase: Meaning and Definition of Find definitions for: a•ce•tyl•cho•lin•es•ter•ase Pronunciation: (u-sēt"l-kō"lu-nes'tu-rās", -rāz", u-set"-, as"i-tl-), [key] — n. Biochem. an enzyme that hydrolyzes the neurotransmitter acetylcholine: its action is blocked by nerve gases and certain drugs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acetylcholine acetyl-coenzyme A Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language