A-py′rōus or Ăp′y-rōus, a.

(Synop., § 130), a. [Gr. ἄπυρος, from ἀ priv. and πῦρ, fire.] Incombustible, or sustaining a strong heat without alteration of form or properties.

☞ Apyrous bodies differ from those simply refractory. Refractory bodies may be altered but not fused by heat. Apyrous bodies can not be altered.