Definition of rho in English:

rho

Syllabification: rho

noun (plural rhos)

  • 1The seventeenth letter of the Greek alphabet (Ρ, ρ), transliterated as ‘r’ or (when written with a rough breathing) ‘rh.’.
    More example sentences
    • He had a dream in which he saw the chi and the rho, the first two Greek letters of Jesus' name, saying ‘In this sign, conquer’, and so he had that emblazoned on a banner he went out the next day under the name of the crucified.
    • Alpha, rho, tau, sigma, omega: Ash went over the letters he saw in his mind while Lari just stared, apparently in her own little world.
    • You're never going to do the conversion right if you think r is equal to phi sine theta, because it isn't; r equals rho sine theta.
  • 1.1 (Rho) [followed by Latin genitive] Astronomy The seventeenth star in a constellation: Rho Cassiopeiae
    More example sentences
    • The final list at the close of the book includes 47 Ursae Majoris, Rho Cancri A, Tau Boötis A, and Upsilon Andromedae.
    • For nearly a decade, astronomers have patiently watched Rho Cassiopeiae, a bloated, relatively cool star 500,000 times brighter than the sun.
    • Only a dozen such hypergiants are known, and scientists suspect that Rho Cassiopeiae will soon destroy itself in a supernova explosion.

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