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Definition of nyctitropism in US English:

nyctitropism

noun

Botany

  • Nyctinasty.

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.

Pronunciation

nyctitropism

/ˌnɪktɪˈtrəʊpɪz(ə)m/