noun

• 1The twenty-first letter of the Greek alphabet (Φ, φ), transliterated as ‘ph.’.

  ‘This use of h was first established in Latin, which used ch, ph, and th for the Greek letters chi, phi, and theta.’

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  • ‘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. 1.1PhiAstronomy followed by Latin genitive The twenty-first star in a constellation.
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     • ‘Phi Eridani’

• 1A plane angle.

• 2A polar coordinate.

  Often coupled with theta