adj.
Pronunciation: ˌ pr ē -s ə - ' nap-tik
Function: adjective
Date: 1937
: of, occurring in, or being a neuron by which a nerve impulse is conveyed to a synapse <a presynaptic membrane> <a presynaptic neuron>
– pre · syn · ap · ti · cal · ly \ -ti-k( ə -)l ē \ adverb