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tetraploid

[te-truh-ploid]
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adjective Biology.
  1. having a chromosome number that is four times the basic or haploid number.
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noun
  1. a tetraploid cell or organism.
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Origin of tetraploid

First recorded in 1925–30; tetra- + -ploid
Related formstet·ra·ploi·dy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tetraploidy

tetraploid

adjective
  1. having four times the haploid number of chromosomes in the nucleus
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noun
  1. a tetraploid organism, nucleus, or cell
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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

tetraploidy in Medicine

tetraploid

(tĕtrə-ploid′)
adj.
  1. Having four times the haploid number of chromosomes in the cell nucleus.
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n.
  1. A tetraploid individual.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.