What's the "een" in Halloween?
1895, used as an adj. corresponding to synapsis, from Greek synaptikos, literally "connective, copulative."
synapsis syn·ap·sis (sĭ-nāp'sĭs)
n. pl. syn·ap·ses (-sēz)
The side-by-side association of homologous paternal and maternal chromosomes during early meiotic prophase.
synaptic syn·ap·tic (sĭ-nāp'tĭk)
Of or relating to synapsis or a synapse.