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[non-dis-juhngk-shuh n] /ˌnɒn dɪsˈdʒʌŋk ʃən/
noun, Biology.
the failure of chromosomes to separate and segregate into daughter cells at division.
Origin of nondisjunction
First recorded in 1910-15; non- + disjunction Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for non-disjunction


the failure of paired homologous chromosomes to move to opposite poles of the cell during meiosis
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
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Word Origin and History for non-disjunction

also nondisjunction, 1913, from non- + disjunction. Related: Non-disjunctional.

Online Etymology Dictionary, © 2010 Douglas Harper
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non-disjunction in Medicine

nondisjunction non·dis·junc·tion (nŏn'dĭs-jŭngk'shən)
The failure of one or more pairs of chromosomes to separate at the miotic stage of karyokinesis, with the result that both chromosomes are carried to one daughter cell and none to the other.

non'dis·junc'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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