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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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References in periodicals archive ?
Objective: Accurate genome duplication is controlled by multi-subunit protein complexes which associate with chromatin and dictate when and where replication should take place.
Coffee lies in the plant family Rubiaceae, which has about 13,000 species and is the world's fourth largest; thus, with no genome duplication at its root, it appears to break the mold of a genome duplication link to high biodiversity," Denoeud said.
Shapiro concludes that living organisms are connected by common descent, but that the evidence points to abrupt change as a result of horizontal transfer, movement of transposable elements, chromosome rearrangements, genome duplication, and cell fusion, all of which reassemble useful genomic elements in novel ways.
In this study researchers proved that nearly 58 million years ago Medicago evolved through a whole genome duplication process.
UK) overview the underlying principles of genome duplication in all forms of life, from the simplest cell to complex multicellular organisms, and how genome duplication impacts and is regulated by cellular activity.
Researchers in a wide range of biological sciences seize the moment by discussing such topics as understanding gene duplication through biochemistry and population genetics, myths and realities of gene duplication, statistical methods for detecting the functional divergence of gene families, the energy and material cost of gene duplication, evolutionary and functional aspects of genetic redundancy, gene and genome duplication in plants, and whole-genome duplications and the radiation of vertebrates.
In fish, there has teen an additional genome duplication, but only about 20% of the duplicated genes were preserved.