situated proximal to a synapse, or occurring before the synapse is crossed.
<anatomy, physiology> Situated proximal to a synapse or occurring before the synapse is crossed. ... (05 Mar 1998) ... 
(pre″sĭ-nap´tik) situated or occurring proximal to a synapse.
Type: Term Pronunciation: prē′sin-ap′tik Definitions: 1. Pertaining to the area on the proximal side of a synaptic cleft.
the region of a synapse that releases the neurotransmitter (in contrast to postsynaptic)
being or occurring on the transmitting end of a discharge across a synapse.