Lewis & Short

3. Pȳtho, ōnis, m., a familiar spirit, the demon possessing a soothsayer (late Lat.), Vulg. Deut. 18, 11: puella habens spiritum pythonem, id. Act. 16, 16: fecit pythonas, et aruspices multiplicavit, id. 4 Reg. 21, 6.