Lewis Short
(adjective) = ἄπυρος, ον: ăpyros, on, , = (without fire): apyron sulpur
* Virgin-sulphur, prepared without fire, Plin. 35, 15, 50, § 174: aurum,obtained without smelting, pure,id. 21, 11, 38, § 66.
Charlton T. Lewis, Charles Short, A Latin Dictionary