World English Dictionary
polysomic (ˌpɒlɪˈsəʊmɪk)
of, relating to, or designating a basically diploid chromosome complement, in which some but not all the chromosomes are represented more than twice
[C20: from poly- + -some³ + -ic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

polysomic pol·y·so·mic (pŏl'ē-sō'mĭk)
Having an extra copy of one or more chromosomes. n.
A polysomic organism or cell.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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