Ρ. Many words beginning with
ρ originally began with two consonants,
esp. ϝρ or σρ
(ϝρήγνυ_μι, σρέω), and the
quantitative (metrical) effect of the two letters has been preserved
in the frequent doubling of ρ (ἔρρεον). What the initial consonant was
cannot always be determined.