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the state of having more than the typical number of chromosomes in unbalanced sets, as in down syndrome.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Presence of extra chromosomes in incomplete sets.
[hyper- + ploidy]
Farlex Partner Medical Dictionary © Farlex 2012