[ mawr-dey-shuh s ]
/ mɔrˈdeɪ ʃəs /


biting or given to biting.
sharp or caustic in style, tone, etc.

Origin of mordacious

1640–50; < Latin mordāci- (stem of mordāx given to biting) + -ous

Related forms

mor·da·cious·ly, adverbmor·dac·i·ty [mawr-das-i-tee] /mɔrˈdæs ɪ ti/, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mordacious

  • Unable longer to endure the lash of his mordacious wit, Shaynon turned and left them alone on the balcony.

    The Day of Days|Louis Joseph Vance
  • Grand-duke and taxes were synonymes, according to this mordacious lexicographer!

British Dictionary definitions for mordacious


/ (mɔːˈdeɪʃəs) /


sarcastic, caustic, or biting

Derived Forms

mordaciously, adverbmordacity (mɔːˈdæsɪtɪ) or mordaciousness, noun

Word Origin for mordacious

C17: from Latin mordax, from mordēre to bite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012