noun
Biological term for directional growth or movement of an organism in response to an external stimulus, such as light or gravity. Compare with 傾性 (nasty), which is non-directional.
See also: 傾性
植物の茎が光の方向に曲がるのは、正の光屈性の例です。
The bending of a plant stem toward light is an example of positive phototropism.
屈性は刺激の方向によって成長の向きが決
Tropism is a phenomenon in which the direction of growth is determined by the direction of the stimulus.