POSITRONIUM Meaning of POSITRONIUM in English positronium BrE AmE ˌpɒz ɪ ˈtrəʊn i‿əm ˌ•ə- AmE \ ˌpɑːz ə ˈtroʊn-▷ positronium|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012