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What is "polyploidy"

Douglas Harper's Etymology Dictionary
polyploidy

1922, from German polyploidie (1910), from polyploid, from Greek poly- (see poly-) + -ploid, from comb. form of ploos "fold" (see fold (v.)) + -oid.

Wiktionary
polyploidy

n. (label en genetics) The state or condition of being a polyploid; having more than the usual two homologous sets of chromosomes.

WordNet
polyploidy

n. the condition of being polyploid

Usage examples of "polyploidy".

Melanoma, Miasma, Treblinka, and Polyploidy in favor of one that sounded safe: Salmonella.

They knew about recent research experiments in the growth field, such as polyploidy or chromosome multiplication- growth hormones-and DNA, the giant molecule which controls cell development.