Source : Webster's Revised Unabridged Dictionary (1913)

Semeiotic \Se`mei*ot"ic\, or Semiotic \Se`mi*ot"ic\, a. [Gr.
   ????, fr. shmei^on a mark, a sign.]
   1. Relating to signs or indications; pertaining to the
      language of signs, or to language generally as indicating
      thought.

   2. (Med.) Of or pertaining to the signs or symptoms of
      diseases.