Definition of monomorphic in English:



  • 1Having or existing in only one form, in particular.

    • ‘The aromatic group had a high proportion of monomorphic loci suggestive of a severe or recent bottleneck.’
    • ‘Three of the loci were monomorphic in all populations.’
    • ‘The type species of Pleuronectites is not monomorphic but shows a substantial range of variation from its earliest to latest occurrences in the Muschelkalk of the Germanic Basin.’
    • ‘Loci are commonly chosen because they were known to be polymorphic in the population studied, while monomorphic loci were not genotyped or discarded from analysis.’
    • ‘Roughly one-half of the microsatellites they isolated in one species were monomorphic in the other and have presumably lost their ability to mutate.’
    1. 1.1(of a species or population) showing little or no variation in morphology or phenotype.
      • ‘The carcinoma consisted of nests of tumor composed of a relatively monomorphic cell population with round nuclei, evenly distributed chromatin, and scanty cytoplasm.’
      • ‘The exceptionally low content of T. dubius units in some 2603-33 plants closely resembles the monomorphic phenotype often seen in relatively ancient allopolyploids.’
      • ‘Nevertheless, frequencies of monomorphic populations were homogeneous over zoogeographical regions.’
      • ‘The lesion was a lobulated circumscribed tumor mass composed microscopically of a monomorphic population of ductal cells.’
      • ‘There were also large differences between populations in diversity, some of the populations being monomorphic and some polymorphic.’
    2. 1.2(of an animal species) having sexes that are similar in size and appearance.
      • ‘Only the ornament-carrying males were observed for the dimorphic species, while both males and females may have been observed for the monomorphic species.’
      • ‘Siberian jays are sexually monomorphic with a substantial overlap in size between sexes.’
      • ‘Molecular sexing can provide an added benefit, especially for sexually monomorphic species.’
      • ‘Unlike many socially polygynous species, house wrens are sexually monomorphic; both sexes are a fairly uniform brownish gray.’
      • ‘Many bird species are morphologically monomorphic for external characters that would differentiate the sexes; sex identification in populations is often problematic.’


Late 19th century: from mono- ‘single’ + Greek morphē form.