psi
1[ sahy, psahy ]
/ saɪ, psaɪ /
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noun, plural psis.
the 23rd letter of the Greek alphabet (Ψ, ψ).
the group of consonant sounds represented by this letter.
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Origin of psi
11350–1400; Middle English <Greek pseî
Words nearby psi
pseudovector, pseudoxanthoma elasticum, psf, PSG, pshaw, psi, psia, psid, psig, psilanthropism, psilocin
Definition for psi (2 of 3)
psi2
[ sahy ]
/ saɪ /
noun
any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.
Compare pseudoscience, parapsychology.
Origin of psi
21940–45; shortening of psychic or parapsychic
Definition for psi (3 of 3)
psi
or p.s.i.
pounds per square inch.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for psi
British Dictionary definitions for psi (1 of 2)
psi1
abbreviation for
pounds per square inch
British Dictionary definitions for psi (2 of 2)
psi2
/ (psaɪ) /
noun
the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
- paranormal or psychic phenomena collectively
- (as modifier)psi powers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for psi (1 of 2)
psi
[ sī, psī ]
n.
The 23rd letter of the Greek alphabet.
Medical definitions for psi (2 of 2)
ψ
The Greek letter psi. Entries beginning with this character are alphabetized under psi.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.