rho Syllabification: (rho)Pronunciation: /rō/Definition of rho noun (plural rhos) the seventeenth letter of the Greek alphabet (Ρ, ρ), transliterated as ‘r’ or (when written with a rough breathing) ‘rh.’. (Rho) [followed by Latin genitive] Astronomy the seventeenth star in a constellation:Rho Cassiopeiaerho in other Oxford dictionaries Definition of rho in the British & World English dictionary
