polyploidy(redirected from Heptaploidy)
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Having one or more extra sets of chromosomes: a polyploid species; a polyploid cell.
An organism with more than two sets of chromosomes.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.