snake genus belonging to the poisonous viper family Viperidae, including the puff adders (e.g., Bitis arietans; see adder), the Gaboon viper (q.v.; B. gabonica), and the rhinoceros viper (q.v.; B. nasicornis).
BITIS
Meaning of BITIS in English
Britannica English vocabulary. Английский словарь Британика. 2012