Definition of nyctitropism in English:

nyctitropism

Pronunciation /ˌnɪktɪˈtrəʊpɪz(ə)m/

noun

Botany
  • Nyctinasty.

    Originally named nyctitropism, it was later renamed nyctinastism or nyctinasty, as a nastic movement rather than a directional tropism is involved.

Origin

Late 19th century; earliest use found in Charles Darwin (1809–1882), naturalist, geologist, and originator of the theory of natural selection. From nycti- + -tropism.