• (n.) The habit of bending from the sunlight; -- said of certain plants.
A·phe`li·ot'ro·pism noun The habit of bending from the sunlight; -- said of certain plants. 
Type: Term Pronunciation: ap′hē-lē-ot′rō-pizm Definitions: 1. Negative heliotaxis.
apheliotropism, aheliotropism A tendency to bend or to turn away from sunlight; especially, with reference to the leaves of plants.
apheliotropic tendency or type of growth.