trisomy

[trahy-soh-mee]
noun Pathology.
an abnormality characterized by the presence of an additional chromosome to the normal diploid number.

Origin:
1925–30; tri- + -some3 + -y3

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World English Dictionary
trisomy (ˈtraɪsəʊmɪ)
 
n
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
 
[C20: from tri- + (chromo)som(e) + -y³]
 
trisomic
 
adj

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American Heritage
Medical Dictionary

trisomy tri·so·my (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.


tri·so'mic 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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American Heritage
Science Dictionary
trisomy   (trī-sō'mē, trī'sō'-)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In some rare cases, dubbed segmental trisomy, only a specific section of the chromosome is present in triplicate.
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