Definition of triploid in English:



  • 1(of a cell or nucleus) containing three homologous sets of chromosomes.

    ‘a triploid endosperm nucleus’
    • ‘In this type of endosperm, which is the most common in cereals, development starts with several rounds of divisions of the triploid nucleus without cytokinesis.’
    • ‘The first stage, grain enlargement, involves early, rapid division of the zygote and triploid nucleus.’
    • ‘At this stage the triploid endosperm nuclei are approximately the same size as the diploid nuclei of the pericarp and nucellus.’
    • ‘The triploid endosperm nucleus is derived from the fusion of two polar nuclei from the female parent and one sperm nucleus from the male.’
    • ‘The complete set of chromosomes has been duplicated in triploid and tetraploid nuclei.’
    1. 1.1(of an organism or species) composed of triploid cells.
      ‘a triploid carp’
      • ‘Long-term plans allow for the stocking of triploid grass carp, as well as dredging deeper holes and boat lanes.’
      • ‘The endosperm, a result of double fertilization in flowering plants, is a triploid tissue whose genetic composition is more complex than diploid tissue.’
      • ‘So-called triploid fish are unable to reach maturity and so are unable to breed.’
      • ‘In humans, 10% of spontaneous miscarriages are due to triploidy, but triploids of fish and amphibians can grow to adults and some species are even fixed in the triploid state.’
      • ‘Two samples from the original data set were omitted because one was from a triploid plant and the other from a tetraploid.’


  • A triploid organism, variety, or species.

    ‘this cross produces many infertile triploids’
    • ‘Moreover, the high loads of inviable or weak aneuploid pollen produced by triploids induce high selfing rates in normally self-incompatible sexual diploids.’
    • ‘In contrast the data do suggest that gene transcript level in the hybrid triploids is related to genomic dosage.’
    • ‘In triploids, three separate haploid chromosome sets have been observed, as well as one diploid and one haploid set.’
    • ‘Little is known about the transition from diploidy to polyploidy but in some species, triploids are thought to function as intermediates in this transition.’
    • ‘The populations showed continuous morphological variation connecting the species, but karyotypically they consisted of only three types of plants: diploids, triploids, and tetraploids.’