Definition of Mordant

1. Atrial Fibrillation Slideshow Pictures
2. Bad Bugs and Their Bites Slideshow
3. Understanding Ulcerative Colitis Slideshow

Mordant: A substance capable of deepening the reaction to a stain (as in the pathology laboratory); incisive; burning or pungent; and so, by extension, biting and caustic in thought, manner, or style.

The word "mordant" has some bite to it since it comes from the Latin "mordere", the infinitive of the verb "to bite." In French "mordant" means biting.