acetylcholine

ace·tyl·cho·line

noun
\ə-ˌset-^əl-ˈkō-ˌlēn, -ˌsēt-; ˌas-ə-ˌtēl-\

Definition of ACETYLCHOLINE

: a neurotransmitter C₇H₁₇NO₃ released at autonomic synapses and neuromuscular junctions, active in the transmission of nerve impulses, and formed enzymatically in the tissues from choline

—ace·tyl·cho·lin·ic \-kō-ˈlin-ik\ adjective