a. Biol. [f. TROPISM: see -ISTIC.] Pertaining to or constituting tropism.
Hence Tropistically adv. [see -ICALLY], in the way of tropism.
1910. F. Keeble, Plant-Anim., ii. 41. We may use the term tropistic to describe the reactions of both fixed and free organisms to directive stimuli. Ibid., 52. Responding tropistically to unilateral light.
