Psi Definition

sī, psī, psē
noun
The twenty-third letter of the Greek alphabet (Ψ, ψ)
Webster's New World
Such abilities or phenomena collectively.
Webster's New World
Psi is the twenty third letter of the Greek alphabet.
An example of psi is the average human blood pressure of 2.32 psi/1.55 psi which equates to 120/80.
YourDictionary
Synonyms:
  • pounds per square inch
abbreviation
Pounds per square inch.
Webster's New World
Pollutant Standards Index.
Webster's New World
Pounds per square inch.
Wiktionary
Pre-Sentence Investigation.
Wiktionary
Protein Structure Initiative.
Wiktionary
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adjective
Of or having to do with psychic or paranormal abilities or phenomena.
Webster's New World

Other Word Forms of Psi

Noun

Singular:
psi
Plural:
psis

Origin of Psi

  • Middle English from Late Greek from Greek psei

    From American Heritage Dictionary of the English Language, 5th Edition

  • Shortening and alteration of parapsychological

    From American Heritage Dictionary of the English Language, 5th Edition

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