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Meaning of tetraploid

tet•ra•ploid

Pronunciation: (te'tru-ploid"), [key]
— adj. Biol.
  1. having a chromosome number that is four times the basic or haploid number.
—n.
  1. a tetraploid cell or organism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.