The Proto-Indo-European word *hₐélmos
Word *hₐélmos
Meaning spring
See also Proto-Indo-European: *hₐel- ‘to well up, to flow’
Synonyms *bʰreh₁wr̥, *dher-, *wésr̥, *kr̥snehₐ

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