Definition of mordacious
1 : biting or given to biting bitten in as with mordacious acid — Times Literary Supplement
2 : biting or sharp in manner or style : caustic the lady's mordacious look showed plainly that she hated us all — Pauline R. Fadiman
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Origin and Etymology of mordacious
Latin mordac-, mordax biting, given to biting (from mordēre to bite) + English -ious
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