One of the mysteries of the English language finally explained.
A type of tropism in which a plant's leaves move to reduce injuriously intense illumination, usually by keeping their blades parallel to the light rays.
Late 19th century; earliest use found in Charles Darwin (1809–1882), naturalist, geologist, and originator of the theory of natural selection. From para- + heliotropism, probably after paraheliotropic.
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