(1):
(a.) Of or pertaining to tetanus; having the character of tetanus; as, a tetanic state; tetanic contraction.
(2):
(a.) Producing, or tending to produce, tetanus, or tonic contraction of the muscles; as, a tetanic remedy. See Tetanic, n.
(3):
(n.) A substance (notably nux vomica, strychnine, and brucine) which, either as a remedy or a poison, acts primarily on the spinal cord, and which, when taken in comparatively large quantity, produces tetanic spasms or convulsions.