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psi

1

[ sahy, psahy ]

noun

, plural psis.
  1. the 23rd letter of the Greek alphabet (Ψ, ψ).
  2. the group of consonant sounds represented by this letter.

psi

2

[ sahy ]

noun

  1. any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.

psi

3
or p.s.i.
  1. pounds per square inch.

psi

1

/ psaɪ /

noun

  1. the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
    1. paranormal or psychic phenomena collectively
    2. ( as modifier )

      psi powers

psi

2

abbreviation for

  1. pounds per square inch

Discover More

Word History and Origins

Origin of psi1

1350–1400; Middle English < Greek pseî

Origin of psi2

1940–45; shortening of psychic or parapsychic

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