Designed or treated to withstand freezing temperatures without cracking, breaking, or being damaged.
Compound of 'frost' and 'proof' (from Old French 'prover,' meaning to test). 'Proof' in compounds means protected against or resistant to something.
Modern materials science developed frostproof ceramics and bricks by understanding how water trapped in tiny pores expands when it freezes—so engineers had to engineer materials that could handle that expansion.
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