The Collaborative International Dictionary of English v.0.48:

Epispastic \Ep"i*spas"tic\, a. [Gr. ?, fr. ? to draw to,
   attract; ? to + ? to draw: cf. F. ['e]pispastique.] (Med.)
   Attracting the humors to the skin; exciting action in the
   skin; blistering.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Epispastic \Ep"i*spas"tic\, n. (Med.)
   An external application to the skin, which produces a
   puriform or serous discharge by exciting inflammation; a
   vesicatory.
   [1913 Webster]