a. Obs. [f. prec. + -AL.] Of caustic nature or operation.
1676. Wiseman, Chirurg. Treat., IV. iv. 259 (J.). If Extirpation be safe, the best way will be by causticall Medicines or Escaroticks.
1702. E. Baynard, Cold Baths, II. (1709), 237. The Caustical Salts.
