RH Meaning of RH in English Rh BrE AmE ˌɑː r ˈeɪtʃ ◂ § ˌɑː ˈheɪtʃ AmE ˌɑːr ˈeɪtʃ ◂ —or as ˈ Rhesus ▶ ˌ R ˈ h factor BrE AmE▶ ˌ Rh ˈ negative BrE AmE▶ ˌ Rh ˈ positive BrE AmE Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012