[ hap-loid ]
/ ˈhæp lɔɪd /

adjective Also hap·loi·dic.

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.



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Origin of haploid

First recorded in 1905–10; hapl- + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for haploid

  • 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
  • Haploid (n) chromosome numbers were determined from cells in diakinesis, metaphase I, and metaphase II of meiosis.

  • 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
  • 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

British Dictionary definitions for haploid

/ (ˈhæplɔɪd) biology /

adjective also: haploidic

(esp of gametes) having a single set of unpaired chromosomes


a haploid cell or organism
Compare diploid

Derived forms of haploid

haploidy, noun

Word Origin for haploid

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

Medical definitions for haploid

[ hăploid′ ]


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.


A haploid organism or cell.

Other words from haploid

haploi′dy (-loi′dē) n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for haploid

[ hăploid′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.