1The twenty-first letter of the Greek alphabet (Φ, φ), transliterated as ‘ph.’
- ‘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.’
- ‘This use of h was first established in Latin, which used ch, ph, and th for the Greek letters chi, phi, and theta.’
- 1.1Astronomy [followed by Latin genitive]The twenty-first star in a constellation.‘Phi Eridani’
1A plane angle.
2A polar coordinate.Often coupled with theta