psi
psi1 definition
psi (sī, psē)
noun
the twenty-third letter of the Greek alphabet (Ψ, ψ)
Etymology: LGr < Gr psei
psi2 definition
psi (sī)
adjective
of or having to do with psychic or paranormal abilities or phenomena
noun
such abilities or phenomena collectively
psi3 definition
psi
pounds per square inch
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