The story
- Proto-Indo-European*tep-
- Proto-Indo-European*t(e)péh₁yeti
- Proto-Italic*tepēō
- Latintepeō
- Proto-Indo-European*dʰeh₁-
- Latintepidus
- English todaytepid
Borrowed from Latin tepidus. Cognate with Sanskrit तप् (tap), Proto-Slavic *teplъ.
Etymology from Wiktionary, CC BY-SA 4.0.