Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

Thyestes, ae, m., = Θυέστης, son of Pelops and brother of Atreus, who set before him for food the flesh of his own son; he was the father of Ægisthus, Hyg. Fab. 88; Plaut. Rud. 2, 6, 25; Cic. Tusc. 3, 12, 26; Hor. A. P. 91; id. C. 1, 16, 17; Pers. 5, 8.
Hence,

  1. A. Thyestēus, a, um, adj., of or belonging to Thyestes, Thyestean: Mycenae, Luc. 1, 544: mensa, Ov. P. 4, 6, 47; id. M. 15, 462: exsecratio, Cic. Pis. 19, 43; cf. preces, Hor. Epod. 5, 86: more furere, Sen. Contr. 1, 1 med.
  2. B. Thyestĭădes, ae, m., the (male) offspring of Thyestes; said of Ægisthus, Ov. A. A. 2, 407; Claud. VI. Cons. Hon. 113.