an enzyme which hydrolyzes a choline ester; esp., acetylcholine, which converts to choline and acetic acid, thus canceling a nerve impulse transmission
See cholinesterase in American Heritage Dictionary 4
(kōˌlə-nĕsˈtə-rāsˌ, -rāzˌ)
noun
An enzyme found primarily at nerve endings that catalyzes the hydrolysis of acetylcholine into acetic acid and choline.