Lewis & Short

2. Cŏrax, ăcis (acc. -acem, Cic. de Or. 3, 21, 81; -aca, Quint. 2, 17, 7), m., the most ancient Greek rhetorician in Sicily, a contemporary, perhaps also teacher, of Lysias, Cic. de Or. 1, 20, 91; id. Brut. 12, 46; Quint. 2, 17, 7; 3, 1, 8.
In a play upon words: quare Coracem istum vestrum patiamur nos quidem pullos suos excludere, etc., Cic. de Or. 3, 21, 81.