follow Dictionary.com

Get our exclusive Word of the Day images!

polyploid

[pol-ee-ploid] /ˈpɒl iˌplɔɪd/
adjective
1.
having a chromosome number that is more than double the basic or haploid number.
noun
2.
a polyploid cell or organism.
Origin
1915-1920
1915-20; poly- + -ploid
Related forms
polyploidic, adjective
polyploidy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for polyploidy
  • Instead of making gametes with only one copy of each chromosome, they created ones with two or more, a state called polyploidy.
  • What is really cool about polyploidy in plants is the immediate divergence to a new species that often accompanies it.
  • Of course, there's also the favorite of plants: polyploidy.
British Dictionary definitions for polyploidy

polyploid

/ˈpɒlɪˌplɔɪd/
adjective
1.
(of cells, organisms, etc) having more than twice the basic (haploid) number of chromosomes
noun
2.
an individual or cell of this type
Derived Forms
polyploidal, polyploidic, adjective
polyploidy, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for polyploidy
n.

1922, from German polyploidie (1910), from polyploid, from Greek poly- (see poly-) + -ploid, from comb. form of ploos "fold" (see fold (v.)) + -oid.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
polyploidy in Medicine

polyploid pol·y·ploid (pŏl'ē-ploid')
adj.
Having extra sets of chromosomes. n.
An organism with more than two sets of chromosomes.


pol'y·ploi'dy n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
polyploidy in Science
polyploid
  (pŏl'ē-ploid')   
Having more than two complete sets of chromosomes. Many plants that are polyploid, such as dandelions, are sterile but can reproduce by apomixis or other asexual means. Other polyploid plants are fertile. For example, durum wheat (Triticum turgidum durum), which is used to make pasta, is tetraploid (it has four sets of chromosomes), while bread wheat (Triticum aestivum) is hexaploid (six sets of chromosomes). Polyploid plants, if viable, are often larger or more productive than diploid plants, and plant breeders often deliberately produce such plants by crossing species or other means. In the animal kingdom, polyploidy is abnormal and often fatal.
polyploidy
  (pŏl'ē-ploi'dē)   
The state or condition of being polyploid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Encyclopedia Article for polyploidy

the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. In other words, the polyploid cell or organism has three or more times the haploid chromosome number. Polyploidy arises as the result of total nondisjunction of chromosomes during mitosis or meiosis.

Learn more about polyploidy with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for polyploid

Few English speakers likely know this word

Word Value for polyploidy

21
0
Scrabble Words With Friends

Nearby words for polyploidy