| polyploid | Of a nucleus, cell or organism that has more than two haploid sets of chromosomes. A cell with three haploid sets (3n) is termed triploid, four sets (4n) tetraploid and so on. (18 Nov 1997) |
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| polyploidy | The chromosomal constitution of a cell containing multiples of the normal number of chromosomes; includes triploidy (symbol: 3n), tetraploidy (symbol: 4n), etc. (12 Dec 1998) |