psi

/psaɪ/
/saɪ/
IPA guide

Other forms: psis

Definitions of psi
  1. noun
    the 23rd letter of the Greek alphabet
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    type of:
    alphabetic character, letter, letter of the alphabet
    the conventional characters of the alphabet used to represent speech
  2. noun
    a unit of pressure
    synonyms: pounds per square inch
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    type of:
    pressure unit
    a unit measuring force per unit area
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