TERTIUM QUID Meaning of TERTIUM QUID in English tertium quid BrE AmE ˌtɜːʃ i‿əm ˈkwɪd ˌtɜːt- AmE \ ˌtɝːʃ- ˌtɝːt̬- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012