PSIS

psi

1 [sahy, psahy]
noun, plural psis.
1.
the 23rd letter of the greek alphabet (Ψ, ψ).
2.
the group of consonant sounds represented by this letter.

Origin:
1350–1400; Middle English < Greek pseî

Dictionary.com Unabridged

psi

2 [sahy]
noun
any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.


Origin:
1940–45; shortening of psychic or parapsychic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
psi1
 
abbreviation for
pounds per square inch

psi2 (psaɪ)
 
n
1.  the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
2.  a.  paranormal or psychic phenomena collectively
 b.  (as modifier): psi powers

PSIS
 
abbreviation for
Public Service Investment Society, New Zealand's largest credit union

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

psi 1 (sī, psī)
n.

Symbol ψ The 23rd letter of the greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
psi
pounds per square inch
PSIS
Plastic Surgery Information Service
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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