from
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