syn ‧ apse /ˈsaɪnæps, ˈsɪn- $ ˈsɪnæps, sɪˈnæps/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: synapsis , from Greek , 'joint' , from synaptein 'to fasten together' , from syn- ( ⇨ ↑ syn- ) + haptein 'to fasten' ]
the place where nerve cells meet, especially in the brain
—synaptic /sɪˈnæptɪk/ adjective