Entry 2 senses · 2 variants Webster, 1913 Calefacient · Cal·e·fa·cient · IPA a. n. 01 a. Making warm; heating. 1. Making warm; heating.[R.] 02 n. A substance that excites warmth in the parts to which it is applied, as mustard. 1. A substance that excites warmth in the parts to which it is applied, as mustard.