heliotropism Syllabification: (he·li·ot·ro·pism)Pronunciation: /ˌhēlēˈätrəˌpizəm, ˌhēlēəˈtrōpizəm/Definition of heliotropism noun Botany the directional growth of a plant in response to sunlight. Compare with phototropism. Zoology the tendency of an animal to move toward light. Derivatives heliotropicPronunciation: /ˌhēlēəˈträpik, -ˈtrōpik/ adjective heliotropism in other Oxford dictionaries Definition of heliotropism in the British & World English dictionary
