the seventeenth letter of the Greek alphabet (Ρ, ρ), transliterated as ‘r ’or (when written with a rough breathing) ‘rh’ 希腊字母表中第十七个字母(译写为r,与送气符写在一起时译写为rh) ■(Rho)[followed by Latin genitive](Astronomy)the seventeenth star in a constellation (天文)ρ星(星座中第十七颗星) Rho Cassiopeiae. 仙后座ρ星。