Definition of haploid in English:



  • 1(of a cell or nucleus) having a single set of unpaired chromosomes.

    Compare with diploid
    • ‘The number of linkage groups resolved agrees well with the cytologically determined haploid chromosome number of 21.’
    • ‘The computer keeps track of each mutation's position and deleterious effect on a single haploid chromosome for each individual.’
    • ‘Two of them are seen in a single haploid nucleus.’
    • ‘Each basidiospore contains a recombinant haploid nucleus, the product of meiosis.’
    • ‘The FB-MOs, mitochondria, and haploid nuclei all segregate into budding spermatids and eventually occupy most of the cytoplasmic space.’
    1. 1.1(of an organism or part) composed of haploid cells.
      • ‘We conclude that Dempster's 1955 discrete-time model is irrelevant to the vast majority of haploid species subject to density-dependent population regulation.’
      • ‘Two of the haploid plants generated from Fuyu 3xWMR 29 crosses were susceptible to races 1, 6, and 7.’
      • ‘They differ from the ‘green algae’ in that the young sporophyte - or diploid plant - begins its development within the tissues of its parent gametophyte - or haploid plant.’
      • ‘Due to the colchicine-induced or spontaneous process of chromosome doubling that takes place during the early stages of embryo development, fertile double haploid plants can be easily regenerated within a short period of time.’
      • ‘Most of the remaining plants regenerated are sterile haploid plants while a few partially sterile plants could be polyploid or aneuploid.’


  • A haploid organism or cell.

    • ‘Meiosis is the program used by sexually reproducing organisms to produce haploids from diploid precursors.’
    • ‘This is likely to be the null phenotype for pob3 mutants since we observed a similar accumulation of cells after germination of haploids carrying a deletion of POB3.’
    • ‘The number of recombinants and total cells for haploids was corrected to reflect the entire culture.’
    • ‘The next two sections illustrate how to do this by carrying out the calculations for autosomal genes in dioecious haploids and for autosomal, sex-linked, and cytoplasmic genes in diploids.’
    • ‘First, tetraploids continue to bud in stationary phase, whereas haploids arrest as unbudded cells.’


Early 20th century: from Greek haploos single + -oid.