Lewis Short
Thestĭus | Thestĭă-des, ae | Thestĭas, ădis (noun M.m.f) : Θέστιος
* A king of Aetolia, father of Leda and Althaea, and of Plexippus and Toxeus, Ov. M. 8, 487; Hyg. Fab. 77; 155; 174.—Hence
* A (male) descendant of Thestius: duo,i. e. Plexippus and Toxeus,Ov. M. 8, 304 and 434: respice Thestiaden,i. e. Meleager, son of Althaea,id. F. 5, 305.
* The daughter of Thestius, i. e. Althaea, Ov. M. 8, 452; 8, 473; id. Tr. 1, 7, 18.
Charlton T. Lewis, Charles Short, A Latin Dictionary