Rha, indecl., = Ῥᾶ,
the Wolga , on whose banks grew the radix pontica, Rha ponticum, rhubarb (Rheum Rhaponticum, Linn.), which thence received its name, Amm. 22, 8, 28 (cf. Cels. 5, 23 fin. ).
RHA(Ῥᾶ ποταμός, Ptol. 5.9. §§ 12, 17, 19, 21, 6.14. §§ 1, 4; Ammian. 22.8.28; Ῥῶς, Agathem. 2.10: Vo...
Dictionary of Greek and Roman Geography