Definition of "polyploid" []

• Having one or more extra sets of chromosomes: a polyploid species; a polyploid cell. (adjective)
• An organism with more than two sets of chromosomes. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Wendel 2008 Partitioned expression of duplicated genes during development and evolution of a single cell in a polyploid plant."
• "Incipient polyploid speciation in the maidenhair fern (Adiantum pedatum, adiantaceae)?"
• "If the diet was stored initially for 6 weeks following irradiation before being fed to the animals no increase in the number of polyploid cells was noted."