Cĕraunus, i, m., = Κεραυνός,
cognomen of king Ptolemaeus , of Macedonia , son of Ptolemaeus Lagi , Nep. Reg. 3, 4.
cĕraunus, a, um, v. ceraunius. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.