calefacient
/ˌkalɪˈfeɪʃ(ə)nt
/noun archaic
A drug or other substance that gives a sensation of warmth.If taken with wax from Cyprus, with fresh olive oil, or with any other calefacient, this stone greatly helps those suffering from rheumatism and paralysis.
Origin
Mid 17th century: from Latin calefacient- 'making warm', from the verb calefacere, from calere 'be warm' + facere 'make'.