acetylcholine acetylcholine /əˌsiːtlˈkoʊliːn/

noun

1. A neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems  ( acetylcholine )
   a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems