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trisomy

[trahy-soh-mee]
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noun Pathology.

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. 2019

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British Dictionary definitions for trisomy

trisomy

noun

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 for trisomy

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
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
trisomy in Medicine

trisomy

[trī-sō′mē, trī′sō′-]

n.

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•so′mic adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
trisomy in Science

trisomy

[trī-sō′mē, trī′sō′-]

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.