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noun Pathology.
  1. an abnormality characterized by the presence of an additional chromosome to the normal diploid number.

Origin of trisomy

First recorded in 1925–30; tri- + -some3 + -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for trisomy


  1. the condition of having one chromosome of the set represented three times in an otherwise diploid organism, cell, etc. Trisomy of chromosome 21 results in Down's syndrome
Derived Formstrisomic (traɪˈsəʊmɪk), adjective

Word Origin

C20: from tri- + (chromo) som (e) + -y ³
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 trisomy


1930, from trisomic (1921), from tri- + ending from chromosome.

Online Etymology Dictionary, © 2010 Douglas Harper

trisomy in Medicine


([object Object])
  1. The condition of having three copies of a given chromosome or chromosome segment in each somatic cell rather than the normal number of two.
Related formstri•somic adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

trisomy in Science


[trī-sōmē, trīsō′-]
  1. The condition of having three copies of a given chromosome in each body cell rather than the normal number of two.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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