pi (p )n. pl. pis Symbol  The 16th letter of the Greek alphabet. |
pI (p  )n. The pH value for the isoelectric point of a given substance in solution. |
pi
[pī]
1 Ρ, π, the sixteenth letter of the Greek alphabet.
2 (in mathematics) the ratio of a circle's circumference to its diameter.
Pi
inorganic orthophosphate.
pI
isoelectric point.
pi
the sixteenth letter of the Greek alphabet, π or π.
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