Relating to or made of fire-resistant or non-combustible material; fireproof.
From Greek 'a-' (without) + 'pyr' (fire), literally meaning 'without fire' or resistant to it. An archaic term appearing in material science and architecture contexts.
Before modern fire codes, architects tested building materials by literally setting them on fire—those that didn't catch were declared 'apyrous' and celebrated as protection against the biggest urban hazard of the era!
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