World English Dictionary
aneuploid (ˈænjʊˌplɔɪd)
1.  (of polyploid cells or organisms) having a chromosome number that is not an exact multiple of the haploid number, caused by one chromosome set being incomplete
2.  a cell or individual of this type

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

abnormal number of chromosomes, 1934, from aneuploid (1931), coined 1922 by G. Täckholm, Mod.L., from an- "not" + euploid, from Gk. eu- "well, good" + -ploid (comb. form of ploos "fold" + -oid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

aneuploidy an·eu·ploi·dy (ān'yə-ploi'dē)
The state of having a chromosome number that is not a multiple of the haploid number.

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
aneuploidy   (ān'yə-ploi'dē)  Pronunciation Key 
The state or condition of being aneuploid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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