presynaptic

(prē'sĭ-năp'tĭk)
adj.
Situated in front of or occurring before a synapse: a presynaptic nerve fiber; a presynaptic stimulus.

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(prē'sĭ-năp'tĭk)
adj.

Relating to the area on the proximal side of a synaptic gap.

1. (in anatomy)
   (a) designating a neuron that transmits an impulse directly to a synapse.
   
   (b) of or pertaining to that part of such a neuron close to the synapse.
   
2. (in cytology) prior to meiotic synapsis.

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Situated or occurring proximal to a synapse.