chemotropism Syllabification: (che·mot·ro·pism)Pronunciation: /kiˈmätrəˌpizəm/Definition of chemotropism noun a tropism, especially of a plant, in response to a particular substance. Derivatives chemotropicPronunciation: /ˌkēmōˈträpik, ˌkemō-, -ˈtrō-/ adjective chemotropicallyPronunciation: /-ik(ə)lē/ adverb