nyctinasty

nyctinasty
\\ˈ ̷ ̷ ̷ ̷ˌnastē\ noun (-es)
Etymology: International Scientific Vocabulary nyct- + -nasty; probably originally formed as German nyktinastie
: a nastic movement (as the opening and closing of some flowers) that is associated with diurnal changes of temperature or light intensity

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nyctinasty /nikˈti-nas-ti/ (botany)
noun
Sleep-movement in plants (eg the closing of petals), the joint effect of changes in light and temperature
ORIGIN: Gr nyx, nyktos night, and nastos pressed
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nyctinasˈtic adjective

Useful english dictionary. 2012.

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