a. [ Gr. &unr_;, fr. &unr_; to draw to, attract; &unr_; to + &unr_; to draw: cf. F. épispastique. ] (Med.) Attracting the humors to the skin; exciting action in the skin; blistering. [ 1913 Webster ]

n. (Med.) An external application to the skin, which produces a puriform or serous discharge by exciting inflammation; a vesicatory. [ 1913 Webster ]