Se`mei*ol"o*gy (?), ∨ Se`mi*ol"o*gy, n. [Gr. shmei^on a mark, a sign + -logy.]
The science or art of signs.
Specifically: (a)
Med. The science of the signs or symptoms of disease; symptomatology
. (b)
The art of using signs in signaling.
© Webster 1913.