psi

Noun
  1. A unit of pressure (synset 113733675)
    is a type of: pressure unit - a unit measuring force per unit area
    same as: pounds per square inch
  2. The 23rd letter of the Greek alphabet (synset 106849543)
    is a type of: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
    belongs to: greek alphabet - the alphabet used by ancient Greeks

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