Meaning of hyperploid

hy•per•ploid

Pronunciation: (hī'pur-ploid"), [key]
— Biol. Biol.
—adj.
  1. having a chromosome number that is greater than but not a multiple of the diploid number.
—n.
  1. a hyperploid cell or organism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.