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- 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）。
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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。
词源
Greek.