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单词 sleep movement
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sleep movement
sleep movement n. Botany a movement of a part of a plant, esp. a leaf, that occurs each nightfall and, in reverse, each daybreak.
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the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > nastic movement > sleep movement
sleep movement1880
1880 C. Darwin & F. Darwin Power of Movement in Plants 262 The periodical movements of leaves thus provided have generally been amplified into so-called sleep-movements.
1906 A. J. Ewart tr. W. Pfeffer Physiol. Plants III. ii. 101 There is no reason for restricting the term nyctinastic to pronounced sleep-movements.
1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 391 Mimosa also shows sleep movements, and at nightfall appears almost as if stimulated by mechanical shock.
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