tetraploid adjective & noun. ['tɛtrǝplɔɪd] E20.
[from TETRA- + -PLOID.]
Biology.
A. adjective. (Of a cell) containing four sets of chromosomes (i.e. the diploid complement twice over); (of an individual) composed of tetraploid cells. E20.
b. noun. A tetraploid individual. E20.

■ tetraploidy noun tetraploid condition E20.

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