Genetic aberration wherein the plant has twice as many chromosome sets as normal, often resulting in very vigorous, large plants and flowers.
Nucleus, cell or organism that has four copies of the normal haploid chromosome set. ... (18 Nov 1997) ... 
(tet´rә-ploid″) pertaining to or characterized by tetraploidy. an individual or cell having four sets of chromosomes.
Having four times (4n) the basic number of chromosomes or twice the diploid number (2n).Nucleus, cell or organism that has four copies of the normal haploid chromosome set.
Type: Term Pronunciation: tet′ră-ployd See: polyploidy
A plant with four sets of chromosomes. A normal plant is diploid with two sets of chromosomes. Most modern complex orchids hybrids are tetraploid.