/ Dictionary / Index C cholinesterase: Meaning and Definition of Find definitions for: cho•lin•es•ter•ase Pronunciation: (kō"lu-nes'tu-rās", -rāz", kol"u-), [key] — n. Biochem. an enzyme, found esp. in the heart, brain, and blood, that hydrolyzes acetylcholine to acetic acid and choline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cholinesterase (Thesaurus) cholinergic cholinolytic Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language