heliotropism
/ˌhiːlɪˈɒtrəpɪzəm/noun
mass noun
1- Botany the directional growth of a plant in response to sunlight【植】（植物的）向光性, 向日性。比较 PHOTOTROPISM.
1.1
- Zoology the tendency of an animal to move towards light【动】（动物的）向光性。
派生词