1. The condition of being mad; insanity; lunacy.
2. Frenzy; ungovernable rage; extreme folly.
Synonym: insanity, distraction, derangement, craziness, lunacy, mania, frenzy, franticness, rage, aberration, alienation, monomania. See insanity.
Origin: From mad.
An acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain.