The Proto-Indo-European word *h₂r̥ĝ-rós
Word *h₂r̥ĝ-rós
Meaning fast
Synonyms *ar(e)-ĝ-, *bʰris-~bʰers-, *h₁ōk̂-us, *k̂eigh-, *h₂ēhₓtró-, *hₐeĝilos

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