AETIOLOGY, Aetiologia, a Rationale, or Discourse of the Cause of a Disease. See DISEASE.In this Sense, we say, the Aetiology of the Small Pox, of the Hydrophobia, of the Gout, the Dropsy, etc. See HYDROPHOBIA, POX, GOUT, DROPSY, etc.The Word is compounded of the Greek aitia, Cause, and logos, Sermon, Discourse.