Definition of photoperiodism in English:

photoperiodism

Syllabification: pho·to·pe·ri·od·ism
Pronunciation: /ˌfōdōˈpirēədizəm
 
/
(also photoperiodicity /-ˌpi(ə)rēəˈdisitē/)

noun

Botany & Zoology
The response of an organism to seasonal changes in day length.
More example sentences
  • When it comes to flowering, photoperiodism is by no means the only game in town.
  • Sensitivity to the timing of light and darkness, termed photoperiodism, involves the integration of temporal information, provided by the circadian oscillator, with light/dark discrimination provided by specific photoreceptors.
  • Cryptochromes are pigmented photoreceptors that are involved in blue-light mediated photomorphogenesis and photoperiodism in plants.

Definition of photoperiodism in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope