Try Our Apps


Avoid these words. Seriously.


[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
First recorded in 1905-10; hapl- + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
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
  • 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
  • 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 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
Cite This Source
Word Origin and History for haploid

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

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
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.
Cite This Source
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.
Cite This Source

Word of the Day

Nearby words for haploid

Difficulty index for haploid

Some English speakers likely know this word

Word Value for haploid

Scrabble Words With Friends