Lewis & Short

Ăres, is, m., = Ἄρης, the war-god Mars (in Plaut. jocosely made to correspond with bellator, warrior): si tu ad legionem bellator clues, at ego in culinā Ares, Plaut. Truc. 2, 7, 54. (For the A, which is always short in Lat., cf. Lucil. ap. Scaur. Orth. p. 2255 P., and Mart. 9, 12, with reference to Hom. Il. 5, 31.)