adj.
Having three times the haploid number of chromosomes in the cell nucleus: triploid somatic cells.
n.
A triploid organism or cell.
triploidy trip'loi·dy n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.