The Collaborative International Dictionary of English v.0.48:

Semeiology \Se`mei*ol"o*gy\ (s[=e]`m[-e]*[o^]l"[-o]*j[y^] or
   s[=e]`m[-i]*[o^]l"[-o]*j[y^]), or Semiology \Se`mi*ol"o*gy\
   (s[e^]m`[-e]*[o^]l"[-o]*j[y^]), n. [Gr. shmei^on a mark, a
   sign + -logy.]
   The study of signs as an element of communication; the
   analysis of systems of communication; -- also called
   semiotics. Specifically:
   (a) (Med.) The science of the signs or symptoms of disease;
       symptomatology.
   (b) The art of using signs in signaling.
       [1913 Webster] Semeiotic