Tetanic

This condition of muscle, this fusion of a number of simple spasms into an apparently smooth, continuous effort, is known as tetanus, or tetanic contraction.

“The convulsions were of a peculiar violence, Dr. Wilkins. I am sorry you were not here in time to witness them. They were quite—tetanic in character.”

Nux vomica, strychnine, and brucine are tetanics.