Definition of phi in English:


Line breaks: phi
Pronunciation: /fʌɪ


  • 1The twenty-first letter of the Greek alphabet (Φ, φ), transliterated as ‘ph’ or (in modern Greek) ‘f’.
    More example sentences
    • This use of h was first established in Latin, which used ch, ph, and th for the Greek letters chi, phi, and theta.
    • The second main group puts together the GDAP1 proteins with those of the zeta, phi, omega, lambda, tau, beta, and theta classes, plus a few minor sets of sequences.
    • To design conserved primers, GST nucleotide and protein sequences from the classes phi, tau, and zeta were obtained from GenBank.
  • 1.1 (Phi) [followed by Latin genitive] Astronomy The twenty-first star in a constellation: Phi Eridani


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  • 1 (φ) A plane angle.
  • 1.1 (φ) A polar coordinate. Often coupled with θ (theta).



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Pronunciation: ˌkələrəˈto͝orə
elaborate ornamentation of a vocal melody