Definition of PSI

psi

Meanings

Plural: psis

Noun

  • a unit of pressure
  • the 23rd letter of the Greek alphabet
  • The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
  • A form of psychic energy.

Symbol

  • Pound per square inch (an imperial unit of pressure)

Origin / Etymology

From Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

Synonyms

pounds per square inch

Scrabble Score: 5

psi is a valid Scrabble (US) TWL word
psi is a valid Scrabble Word in Merriam-Webster MW Dictionary
psi is a valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 6

psi is a valid Words With Friends word