The Proto-Indo-European word *h₂ehₓ-
Word *h₂ehₓ-
Meaning to burn, to be hot
See also Proto-Indo-European: *h₂ehₓmer- ‘day’
Proto-Indo-European: *h₂éhₓōs ‘ash’
Proto-Indo-European: *h₂ehₓsehₐ ‘hearth’
Proto-Indo-European: *h₂ehₓtrehₐ ‘hearth’
Proto-Indo-European: *h₂ēhₓtró- ‘fast, quick’
Synonyms *dhegʷh-, *h₁eus-, *swelp-, *dehau-, *ĝwelhₓ-

Comments
Mallory J.P. and Adams D. (2006)