POLYSYNTHETIC Meaning of POLYSYNTHETIC in English polysynthetic BrE AmE ˌpɒl i sɪn ˈθet ɪk ◂ AmE \ ˌpɑːl i sɪn ˈθet̬ ɪk ◂ Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012