[f. APHELIOTROP-IC + -ISM.] The habit (in plants) of bending away from the light.
1880. Darwin, Movem. Plants, 5. It is much more convenient to confine the word heliotropism to bending towards the light, and to designate as apheliotropism bending from the light.
1880. F. Darwin in Nature, No. 582. 179/1. Hyponasty will of course be opposed by apheliotropism and geotropism.
