the world > health and disease > healing > medical treatment > treatment by gas, air, or fumes > treat by gas, air, or fumes [verb (transitive)] > subject to fumes or vapour (3)
transitive. To subject to a vapour bath; to steam. Obsolete.
transitive. To subject to a vapour-bath; to steam. Obsolete. Cf. evaporation, n. 5.
‘To medicate or heal by vapours’ (Johnson). Obsolete.