This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of synapse.

n. Plural form of synapsis.

v. Third-person singular simple present indicative form of synapse.

"Looking into his eyes while carrying on a conversation was like glimpsing the inner workings of a supercomputer, for you could almost see the sparks flying, brain synapses in rapid fire."

synapsed    synapses    synapsing   

junction    conjugation    conjunction    colligation   

axon    dendrite   

synaptic    ephapse   

neuromuscular junction    myoneural junction   

homeostasis    co-stimulation    neuron    synapses    homunculus