double; twofold.
Biology. having two similar complements of chromosomes.
Biology. an organism or cell having double the basic haploid number of chromosomes.
Crystallography. a solid belonging to the isometric system and having 24 trapezoidal planes.

1905–10; dipl(o)- + -oid

diploidic, adjective
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World English Dictionary
diploid (ˈdɪplɔɪd)
1.  biology (of cells or organisms) having pairs of homologous chromosomes so that twice the haploid number is present
2.  double or twofold
3.  biology a diploid cell or organism

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1908, from Gk. diploos "double" + eidos "form" (see -oid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

diploid dip·loid (dĭp'loid')
Having two sets of chromosomes or double the haploid number of chromosomes in the germ cell, with one member of each chromosome pair derived from the ovum and one from the spermatazoon. The diploid number, 46 in humans, is the normal chromosome complement of an organism's somatic cells. n.
A diploid organism or cell.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
diploid   (dĭp'loid')  Pronunciation Key 
Having paired sets of chromosomes in a cell or cell nucleus. In diploid organisms that reproduce sexually, one set of chromosomes is inherited from each parent. The somatic cells of most animals are diploid. Compare haploid. See Note at mitosis.
The American Heritage® Science Dictionary
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Example sentences
Only a small, sequestered breeding stock is allowed to remain diploid.
Imagine for example a dominant mutation in a diploid organism which produces the behavior of altruism toward near kin.
The number of chromosomes, whether the organism is diploid, the variations in the rate of recombination.
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