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[dip-loid] /ˈdɪp lɔɪd/
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.
Origin of diploid
First recorded in 1905-10; dipl(o)- + -oid
Related forms
diploidic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for diploid
Historical Examples
  • diploid (2n) chromosome numbers were determined from cells in late prophase and metaphase of mitosis.

  • In animals, as in plants, the diploid generation attained the higher development and gradually assumed the dominant position.

    Darwin and Modern Science A.C. Seward and Others
  • The uninitiated sees in the more highly organised plants only a succession of diploid generations.

    Darwin and Modern Science A.C. Seward and Others
  • Similarly all the higher animals appear to us as independent organisms with diploid nuclei only.

    Darwin and Modern Science A.C. Seward and Others
  • They appear with this arrangement in all subsequent nuclear divisions in the diploid generation.

    Darwin and Modern Science A.C. Seward and Others
  • Technically the tissue-cells are said to contain the diploid number of chromosomes, the gametes the reduced or haploid number.

    Being Well-Born Michael F. Guyer
British Dictionary definitions for diploid


(biology) (of cells or organisms) having pairs of homologous chromosomes so that twice the haploid number is present
double or twofold
(biology) a diploid cell or organism
Derived Forms
diploidic, adjective
diploidy, 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
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Word Origin and History for diploid

1908, from Greek diploos "double, twofold," (from di- "two" + root *pel- "to fold;" see ply (v.)) + eidos "form" (see -oid).

Online Etymology Dictionary, © 2010 Douglas Harper
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diploid in Medicine

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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diploid in Science
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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