• WordNet 3.6
    • adj mordacious biting or given to biting "they deliberately gave me a skittish and mordacious mount"
    • adj mordacious capable of wounding "a barbed compliment","a biting aphorism","pungent satire"
    • ***
Webster's Revised Unabridged Dictionary
    • a Mordacious Biting; given to biting; hence, figuratively, sarcastic; severe; scathing.
    • ***
Century Dictionary and Cyclopedia
    • mordacious Biting; given to biting.
    • mordacious Acrid; violent in action.
    • mordacious Sarcastic.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Mordacious mor-dā′shus given to biting: biting:
    • n Mordacious any substance, as alum, used to give permanency or brilliancy to dyes: a glutinous size as a ground for gilding, matter to make gold-leaf adhere: any corrosive liquid by which the biting in etching is effected
    • v.t Mordacious to treat with a mordant
    • adj Mordacious mor-dā′shus (fig.) sarcastic: severe
    • ***


Webster's Revised Unabridged Dictionary
L. mordax, -acis, fr. mordere, morsum, to bite. See Morsel
Chambers's Twentieth Century Dictionary
Fr.,—L. mordax, mordacismordēre, to bite.


In literature:

Hard, mordacious, no man's friend .
"Wolf Breed" by Jackson Gregory