Etymology
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polyploidy (n.)

"condition of having more than two homologous sets of chromosomes," 1922, from German polyploidie (1910), from polyploid, from Greek polys "much, many" (from PIE root *pele- (1) "to fill") + -ploid, from -ploos "fold" (from PIE root *pel- (2) "to fold").

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Definitions of polyploidy

polyploidy (n.)
the condition of being polyploid;
From wordnet.princeton.edu