INFRA- Meaning of INFRA- in English infra- BrE AmE ¦ɪn t f rə▷ — infrasonic ˌɪn t f rə ˈsɒn ɪk ◂ AmE \ -ˈsɑːn- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012