Definition of Nearctic in US English:



  • 1Relating to or denoting a zoogeographical region comprising North America as far south as northern Mexico, together with Greenland. The fauna is closely related to that of the Palearctic region.

    Compare with Holarctic
    • ‘Using a phylogenetically based selection of wild moths collected from a Nearctic site, we report that earless species fly less throughout the night than eared species.’
    • ‘Comparisons were made between larvae of C. lari and larvae of other Nearctic species of Ceratophyllus available to us.’
    • ‘This behavior is also found in the Nearctic gray jay, Perisoreus canadensis, except that, in this species, allofeeding may be allowed during the fledgling period.’
    • ‘Certain migratory species present special problems, given that Austral and Nearctic migratory populations may be involved.’
    • ‘Humans introduced Old World sparrows to the Nearctic, Neotropical and Australian regions.’
    • ‘Although less intensively studied than Nearctic species, numerous Palearctic and Paleotropical species also utter flight calls.’
    • ‘Manv similarities exist between Nearctic and Palearctic goose populations, but there are also many differences.’
    • ‘Personally, I found value in being able to compare sizes and trajectories in the Nearctic goose populations against those of the western Palearctic.’
    • ‘The Ethiopian region showed the greatest diversity and the Nearctic region the least.’
    • ‘Striped skunks are native only to the Nearctic region.’
    1. 1.1as noun the Nearctic The Nearctic region.


Mid 19th century: from neo- ‘new’ + Arctic.