With more than twice the normal haploid set of chromosomes.
An organism with more than two chromosome sets in its vegetative cells.
More than two sets of chromosomes in one cell. Two sets would be diploid; three sets, triploid, four sets, tetraploid, etc.
Referring to a cell where there are more than two copies of each chromosome, which is not viable in humans.
Describing cells, tissues, or individuals in which there are three or more complete sets of chromosomes. Compare diploid, haploid.