(pol-ee-ploid-ee) A chromosomal alteration in which the organism possesses more than two complete chromosome sets.

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

Having more than two sets of chromosomes. polypod larva

Having three or more sets of chromosomes.

The occurrence of one or more additional complete sets

(French : polyploïdie) Cells, tissues or individuals that have more than a diploid set of chromosomes. Triploid and tetraploid embryos are non viable, they are often found in spontaneous abortions.

condition in which the organisms has extra sets of chromosomes

The presence of multiple sets of chromosomes in a cell.

(n) the condition of being polyploid

The chromosomal constitution of a Cell containing multiples of the normal number of Chromosomes; includes Triploidy (symbol: 3N), Tetraploidy (symbol: 4N), etc.

The chromosomal constitution of a cell containing multiples of the normal number of CHROMOSOMES; includes triploidy (symbol: 3N), tetraploidy (symbol: 4N), etc.

The condition of a cell or organism that has more than its normal number of sets of chromosomes.