PYROCLASTIC Meaning of PYROCLASTIC in English pyroclastic BrE AmE ˌpaɪ ə r ə ʊ ˈklæst ɪk ◂ AmE \ -ə-▶ ˌ pyro ˌ clastic ˈ flow BrE AmE Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012