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[hap-loid] /ˈhæp lɔɪd/
adjective, Also, haploidic
single; simple.
Biology. pertaining to a single set of chromosomes.
Biology. an organism or cell having only one complete set of chromosomes, ordinarily half the normal diploid number.
Origin of haploid
1905-10; hapl- + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for haploid
Historical Examples
  • haploid (n) chromosome numbers were determined from cells in diakinesis, metaphase I, and metaphase II of meiosis.

  • Each of these divides again by mitosis (the chromosomes splitting lengthwise), the half or haploid number remaining.

    Taboo and Genetics Melvin Moses Knight, Iva Lowther Peters, and Phyllis Mary Blanchard
  • 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
  • The next stage is their separation to the haploid daughter-nuclei, which have resulted from the reduction process.

    Darwin and Modern Science A.C. Seward and Others
British Dictionary definitions for haploid


(esp of gametes) having a single set of unpaired chromosomes
a haploid cell or organism
Compare diploid
Derived Forms
haploidy, noun
Word Origin
C20: from Greek haploeidēs single, from haplous single
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 haploid

1908, from German haploid (1905), from Greek haplos "single."

Online Etymology Dictionary, © 2010 Douglas Harper
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haploid in Medicine

haploid hap·loid (hāp'loid')
Having the same number of sets of chromosomes as a germ cell, or half the diploid number of a somatic cell. The haploid number (23 in humans) is the normal chromosome complement of germ cells. n.
A haploid organism or cell.

hap'loi'dy (-loi'dē) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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haploid in Science
Having a single set of each chromosome in a cell or cell nucleus. In most animals, only the gametes (reproductive cells) are haploid. Compare aneuploid, diploid. See Note at mitosis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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