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mordacious (adj.)

"given to biting," 1640s (originally figurative, of words, speech, etc.), from Latin mordac-, stem of mordax "biting," from mordēre "to bite," which is perhaps from an extended form of PIE root *mer- "to rub away, harm." Middle English had mordicant (adj.) "corrosive, caustic" (in medicine), early 15c., also mordicative. Related: Mordacity (c. 1600).

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Definitions of mordacious from WordNet

mordacious (adj.)
capable of wounding;
Synonyms: barbed / biting / nipping / pungent
mordacious (adj.)
biting or given to biting;
they deliberately gave me a skittish and mordacious mount
From wordnet.princeton.edu

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