Some patients show none or but few of the signs, while others run the gamut, so to speak, in the semeiology of dyspepsia.
1690s, "sign language," from Greek semeion "a sign, mark, token," from sema (cf. semiotic) + -ology. As "branch of medical science concerned with symptoms," 1839; as "logical theory of signs" from 1923. Related: Semiological.