Definition of long-day in English:

long-day

Syllabification: long-day
Pronunciation: /ˈlôNGˌdā
 
/

adjective

(Of a plant) needing a long period of light each day to initiate flowering, which therefore happens naturally as the days lengthen in the spring.
More example sentences
  • The genetic control of flowering has been extensively studied in Arabidopsis, a quantitative long-day plant that flowers faster under long days than short days.
  • Cereals of temperate origin are typically long-day plants, and this causes heading during spring and early summer, so that the crop ripens towards the end of the growing season.
  • In the long-day plant Arabidopsis, flowering is accelerated under photoperiods exceeding a critical daylength.

Definition of long-day in:

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Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal