noun, plural synapses [si-nap-seez] .
Also called syndesis. Cell Biology. the pairing of homologous chromosomes, one from each parent, during early meiosis.
Physiology, synapse.

1645–55; < Neo-Latin < Greek sýnapsis junction, equivalent to synap- (stem of synáptein to make contact, equivalent to syn- syn- + (h)áptein to touch) + -sis -sis

synaptic [si-nap-tik] , synaptical, adjective
synaptically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synapsis (sɪˈnæpsɪs)
n , pl -ses
1.  cytology the association in pairs of homologous chromosomes at the start of meiosis
2.  another word for synapse
[C19: from New Latin, from Greek sunapsis junction, from sunaptein to join together, from syn- + haptein to connect]

synaptic or synaptical (sɪˈnæptɪk)
of or relating to a synapse
synaptical or synaptical
syn'aptically or synaptical

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American Heritage
Medical Dictionary

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
With eyes closed, superposing simple visual elements on the random visual
  synaptic firing.
First of all, you are creating new synaptic connections with every new activity
  you engage in.
As new stimuli are absorbed, the neurons in the cortex adapt gradually, and
  synaptic connections are forged or eliminated.
The compound is thought to work by reducing the synaptic release of a
  neurotransmitter called glutamate.
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