Definition of: pneumatology

(n′mə·tol′ə·jē, ny′-) noun
1. The doctrine of the nature and operation of spirit, or a treatise on that science; the science of spiritual beings or existence.
2. The science of the beliefs of men touching a world of spirits.
3. The science dealing with the physiology of air or gases.
4. Obs. Pneumatics.
—pneu′ma·to·log′ic (-tə·loj′ik) or ·i·cal adjective
—pneu′ma·tol′o·gist noun