acrious

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• acrid — (adj.) 1712, formed irregularly from L. acer (fem. acris) sharp, pungent, bitter, eager, fierce, from PIE *ak ri , from root *ak be sharp, rise (out) to a point, pierce (Cf. Oscan acrid sharply; Gk. akis sharp point, akros at the farthest point,… …   Etymology dictionary