Webster's English Dictionary

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synapsis

syn.ap.sis \s*-'nap-s*s\ \-'nap-tik\ n [NL, fr. Gk, juncture] 1: the 
   process of association of homologous chromosomes with chiasma format ion 
   characteristic of the first meiotic prophase and the mechanism for 
   crossing-over 2: SYNAPSE  - syn.ap.tic aj