HELIOTROPISM Meaning of HELIOTROPISM in English heliotropism BrE AmE ˌhiːl i ˈɒtr ə ˌpɪz ə m ˈhiːl i‿ə trəʊp ˌɪz-, ˈ•••ˌ•••, ˌ•••ˈ••• AmE \ -ˈɑːtr- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012