polysomy

Medical Dictionary

polysomy pol·y·so·my (pŏl'ē-sō'mē)
n.
The state of a cell nucleus in which a specific chromosome is represented more than twice.

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

noun
congenital defect of having one or more extra chromosomes in somatic cells 
WordNet® 3.0, © 2006 by Princeton University.
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