{ Se′mei‐ol″o‐gy (–ŏl″ō̍‐jy̆), orSe′mi‐ol″o‐gy }, n. [Gr. σημει̑ον 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.