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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.

pol′y·ploi′dy n.
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Noun1.polyploidy - the condition of being polyploid
condition - a mode of being or form of existence of a person or thing; "the human condition"
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41 pg indicating that they were septaploids with 63 chromosomes (45 + 18 = 63) resulting from fertilization of unreduced gametes (Table 3).
1987) observed septaploids among big bluestem plants grown from "wild" seed.