Definition of paraheliotropic in US English:

paraheliotropic

adjective

Botany
  • Relating to or characterized by paraheliotropism; (of leaves or their movements) turning to reduce intense illumination.

Origin

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