{ or }, a. [ Gr. shmeiwtiko`s, 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. [ 1913 Webster ]

2. (Med.) Of or pertaining to the signs or symptoms of diseases. [ 1913 Webster ]

{ or }, n. 1. The study of signs as an element of communication; the analysis of systems of communication; -- also called semiology. [ PJC ]

2. a theory of signs and symbols, including as branches semantics, pragmatics and syntactics. [ RHUD ] [ PJC ]