See Also:

phi (iou)



phi noun. LME.
[Greek.]
The twenty-first letter (¦µ, ¦Õ) of the Greek alphabet. LME.
Petrography. An index of particle size, defined as the negative of the logarithm to the base 2 of the diameter in millimetres. Freq. attrib., as phi scale, phi value, and written as ¦Õ. M20.
Statistics. phi coefficient, the product-moment coefficient of correlation in a case where each of the observed variables has only two possible values. M20.
Particle Physics. In full phi meson. Any of a group of mesons which have the same quantum numbers as the omega meson but a mass of 1019 MeV, and on decaying usu. produce two kaons or three pions. Freq. written ¦Õ. M20.
? Rare before M19.