Polyploidy

[pol-ee-ploid]

pol·y·ploid

[pol-ee-ploid] Biology
adjective
1.
having a chromosome number that is more than double the basic or haploid number.
noun
2.
a polyploid cell or organism.

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Polyploidy is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.

Origin:
1915–20; poly- + -ploid

pol·y·ploi·dic, adjective
pol·y·ploi·dy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
polyploid (ˈpɒlɪˌplɔɪd)
 
adj
1.  (of cells, organisms, etc) having more than twice the basic (haploid) number of chromosomes
 
n
2.  an individual or cell of this type
 
poly'ploidal
 
adj
 
poly'ploidic
 
adj
 
'polyploidy
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
polyploidy   (pŏl'ē-ploi'dē)  Pronunciation Key 
The state or condition of being polyploid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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