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psi
1[ sahy, psahy ]
noun
, plural psis.
- the 23rd letter of the Greek alphabet (Ψ, ψ).
- the group of consonant sounds represented by this letter.
psi
2[ sahy ]
noun
- any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.
psi
3or p.s.i.
- pounds per square inch.
psi
1/ psaɪ /
noun
- the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
- paranormal or psychic phenomena collectively
- ( as modifier )
psi powers
psi
2abbreviation for
- pounds per square inch
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Word History and Origins
Origin of psi1
1350–1400; Middle English < Greek pseî
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