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pre·syn·ap·tic -sə-'nap-tik adj relating to, occurring in, or being part of a nerve cell by which a wave of excitation is conveyed to a synapse <\presynaptic terminals> <\presynaptic inhibition> <a \presynaptic membrane>
pre·syn·ap·ti·cal·ly -ti-k(ə-)lē adv
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pre·syn·ap·tic (pre″sĭ-napґtik) situated before or proximal to a synapse, or occurring before the synapse is crossed.Medical dictionary. 2011.