Designed to resist, prevent, or protect against invasion or damage by ants; treated to be impervious to ants.
Compound word from ant + proof (from Latin proba, 'to test' or 'to approve,' later meaning 'resistant to'). The '-proof' suffix became productive in English around the 16th-17th centuries for creating adjectives meaning 'protected against' (as in waterproof, fireproof, weatherproof).
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