• synonyms


noun, plural syn·ap·ses [si-nap-seez] /sɪˈnæp siz/.
  1. Also called syndesis. Cell Biology. the pairing of homologous chromosomes, one from each parent, during early meiosis.
  2. Physiology. synapse.
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Origin of synapsis

1645–55; < New Latin < Greek sýnapsis junction, equivalent to synap- (stem of synáptein to make contact, equivalent to syn- syn- + (h)áptein to touch) + -sis -sis
Related formssyn·ap·tic [si-nap-tik] /sɪˈnæp tɪk/, syn·ap·ti·cal, adjectivesyn·ap·ti·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for synapsis

Historical Examples of synapsis

  • The method of synapsis in Coptocycla is like that described for Chelymorpha argus.

    Studies in Spermatogenesis

    Nettie Maria Stevens

  • There is in the male, in addition to the X, also a Y chromosome, which acts as its mate in synapsis and reduction.

  • From this synapsis the lower neurone proceeds, its axons travelling to the anterior horn and arborising around the motor cells.

  • The synizesis and synapsis stages are similar to those in Chelymorpha (figs. 61 and 62).

    Studies in Spermatogenesis

    Nettie Maria Stevens

British Dictionary definitions for synapsis


noun plural -ses (-siːz)
  1. cytology the association in pairs of homologous chromosomes at the start of meiosis
  2. another word for synapse
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Word Origin for synapsis

C19: from New Latin, from Greek sunapsis junction, from sunaptein to join together, from syn- + haptein to connect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for synapsis


plural synapses, 1895 in biology, Modern Latin, from Greek synapsis "connection, junction" (see synapse).

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Online Etymology Dictionary, © 2010 Douglas Harper

synapsis in Medicine


n. pl. syn•ap•ses (-sēz)
  1. The side-by-side association of homologous paternal and maternal chromosomes during early meiotic prophase.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.