Definition of PSI

psi

Plural: psis

Noun

  • The 23rd letter of the Greek alphabet (Ψ, ψ).
  • 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)

Examples

  • Playing PSI for 13 points was a small but satisfying Greek letter victory.

Origin / Etymology

From Middle English psi, from Latin psī, 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: valid Scrabble (US) TWL Word
psi: valid Scrabble Word in Merriam-Webster MW Dictionary
psi: valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 6

psi: valid Words With Friends Word