Definition: mordacious

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Source: WordNet (r) 1.7 

mordacious
     adj : capable of wounding; "a barbed compliment"; "a biting
           aphorism"; "pungent satire" [syn: barbed, biting, nipping,
            pungent]

Source: Webster's Revised Unabridged Dictionary (1913) 

Mordacious \Mor*da"cious\, a. [L. mordax, -acis, fr. mordere,
   morsum, to bite. See Morsel.]
   Biting; given to biting; hence, figuratively, sarcastic;
   severe; scathing. -- Mor*da"cious*ly, adv.