[pol-ee-ploid] Biology.
having a chromosome number that is more than double the basic or haploid number.
a polyploid cell or organism.

1915–20; poly- + -ploid

polyploidic, adjective
polyploidy, noun
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World English Dictionary
polyploid (ˈpɒlɪˌplɔɪd)
1.  (of cells, organisms, etc) having more than twice the basic (haploid) number of chromosomes
2.  an individual or cell of this type

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American Heritage
Medical Dictionary

polyploid pol·y·ploid (pŏl'ē-ploid')
Having extra sets of chromosomes. n.
An organism with more than two sets of chromosomes.

pol'y·ploi'dy n.
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
polyploid   (pŏl'ē-ploid')  Pronunciation Key 
Having more than two complete sets of chromosomes. Many plants that are polyploid, such as dandelions, are sterile but can reproduce by apomixis or other asexual means. Other polyploid plants are fertile. For example, durum wheat (Triticum turgidum durum), which is used to make pasta, is tetraploid (it has four sets of chromosomes), while bread wheat (Triticum aestivum) is hexaploid (six sets of chromosomes). Polyploid plants, if viable, are often larger or more productive than diploid plants, and plant breeders often deliberately produce such plants by crossing species or other means. In the animal kingdom, polyploidy is abnormal and often fatal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for polyploid
Polyploid animals are often sterile, so they often reproduce by parthenogenesis.
Polyploid salamanders and lizards are also quite common and parthenogenetic.
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