The Collaborative International Dictionary
Apyrous
Apyrous \Ap"y*rous\, a. [Gr. ?; 'a priv. + ? fire.] Incombustible; capable of sustaining a strong heat without alteration of form or properties. [1913 Webster] ||
Wiktionary
apyrous
a. Not combustible; capable of tolerating great heat without alteration of form or properties.