LSJ
ατος, τό, that which is burnt in magic, PMagPar. 1.1308, al. ; sacrificial victim, Hsch. s.v. ἱεράθετα.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, das Geopferte, Opfertier, Hesych.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)