TRI- Meaning of TRI- in English tri- as a productive prefix BrE AmE ¦traɪ▷ — but in certain established words ¦trɪ (see entries) —▷ trichromatic ˌtraɪ krə ʊ ˈmæt ɪk ◂ AmE \ -kroʊ ˈmæt̬- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012