The Proto-Indo-European word *tep-
Word *tep-
Meaning warm
Synonyms *gʷhermos, *k̂el-, *gʷhrensós

Comments
Alb. ftoh/ftof, Hitt. tapašša, Ir. té/, Welsh tan, ON þefr, Eng. þefian/, Skr. tapati, Av. tāpaiti, Pers. /tafte(h), Lat. tepēre, Polish ciepły, Russ. tëplyj, OCS teplostĭ