- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mordacious
- sarcastic, caustic, or biting
C17: from Latin mordax, from mordēre to bite
Word Origin and History for mordacious
"given to biting," 1640s (originally figurative), from Latin mordac-, stem of mordax, from mordere "to bite," perhaps from PIE root mer- (2) "to rub, harm" (see smart (v.)). Related: Mordacity.
Online Etymology Dictionary, © 2010 Douglas Harper