p.s.i.

abbr. pounds per square inch.

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psi¹ «sy, psee», noun.

the 23rd letter of the Greek alphabet, corresponding to the sound s or sometimes ps in English.

╂[< Greek psî]

psi² «sy, psee», noun.

the group of psychological or nonphysical phenomena, including extrasensory perception, telepathy, and clairvoyance, that forms the subject matter of parapsychology: »

Nonphysical though psi appears to be as judged by the familiar criteria of space and time, it is, nonetheless, a natural function of the normal personality (Science).

╂[< Greek psî, first letter of ps breath, life, soul]

p.s.i. or psi (no periods),

pounds per square inch: »

It takes quite a sophisticated shelter to withstand 100 psi overpressure (Harper's).

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abbr. pounds per square inch

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p.s.i. 7 [p.s.i.] [ˌpiː es ˈaɪ] [ˌpiː es ˈaɪ] abbreviation

pounds per square inch (used for giving the pressure of tyres, etc.)