Word.ws English Dictionary

Plural of psi

regular plural

The plural of psi is psis.

Forms of psi

Singularpsi /psaɪ/
Pluralpsis
Countablecountable and uncountable

Meaning of psi

  1. noun The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
  2. noun A form of psychic energy.
  3. symbol Pound per square inch (an imperial unit of pressure).

Full definition of psi

Questions about the plural of psi

What is the plural of psi?
The plural of psi is psis.
Is psi countable?
Psi is a countable and uncountable noun.

Source and license

Adapted from Wiktionary: psi (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

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Cite this page: “Plural of psi.” Word.ws, https://word.ws/plural/psi. Based on Wiktionary, CC BY-SA 4.0.