(1):

(n.) Extreme, unreasonable, or fanatical in opinion; excessively zealous; as, a rabid socialist.

(2):

(n.) Furious; raging; extremely violent.

(3):

(n.) Of or pertaining to rabies, or hydrophobia; as, rabid virus.

(4):

(n.) Affected with the distemper called rabies; mad; as, a rabid dog or fox.