pneumatist
/ˈnjuːmətɪst/Now historical
noun
1 History of Science. An advocate or adherent of the pneumatic theory of physiology.
2An advocate or practitioner of pneumatic medicine or chemistry.
Origin
Late 17th century (in an earlier sense). From ancient Greek πνευματ-, πνεῦμα + -ist. Compare Hellenistic Greek οἱ Πνευματικοί.