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We found 51 dictionaries with English definitions that include the word psi:
Click on the first link on a line below to go directly to a page where "psi" is defined.

General (24 matching dictionaries)

1. psi: Merriam-Webster.com [home, info]
2. Psi, p.s.i, psi: Oxford Dictionaries [home, info]
3. psi, psi, psi: American Heritage Dictionary of the English Language [home, info]
4. psi: Collins English Dictionary [home, info]
5. psi: Vocabulary.com [home, info]
6. Psi, psi: Wordnik [home, info]
7. PSI, psi: Wiktionary [home, info]
8. psi: Webster's New World College Dictionary, 4th Ed. [home, info]
9. psi: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. psi: Infoplease Dictionary [home, info]
11. p.s.i, psi: Dictionary.com [home, info]
12. psi: UltraLingua English Dictionary [home, info]
13. PSI (album), PSI (computational chemistry), PSI, Psi (Brazilian TV series), Psi (Cyrillic), Psi (Greek), Psi (TV series), Psi (comics), Psi (disambiguation), Psi (instant messaging client), Psi (instant messenger), Psi (letter), Psi (parapsychology), Psi: Wikipedia, the Free Encyclopedia [home, info]
14. psi: Rhymezone [home, info]
15. PSI, psi: Stammtisch Beau Fleuve Acronyms [home, info]
16. psi: All About Homonyms [home, info]
17. psi: Hutchinson's Dictionary of Difficult Words [home, info]
18. psi: Free Dictionary [home, info]
19. psi: Hutchinson Dictionaries [home, info]
20. psi: Mnemonic Dictionary [home, info]
21. psi: WordNet 1.7 Vocabulary Helper [home, info]
22. psi: LookWAYup Translating Dictionary/Thesaurus [home, info]
23. psi: Dictionary/thesaurus [home, info]
24. psi: Wikimedia Commons US English Pronunciations [home, info]

Art (1 matching dictionary)

25. P.S.I: Glossary of Stamp Collecting Terms [home, info]

Business (2 matching dictionaries)

26. PSI: Construction Term Glossary [home, info]
27. PSI (Pounds Per Square Inch): Glossary of Trucking Terms [home, info]

Computing (2 matching dictionaries)

28. PSI: Free On-line Dictionary of Computing [home, info]
29. psi: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

30. PSI, psi: online medical dictionary [home, info]
31. psi: Hepatitis C Information Central [home, info]
32. p.s.i, p.s.i, psi: Medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

33. PSI: Acronym Finder [home, info]
34. Psi: Glossary of Terms in Parapsychology [home, info]
35. PSI: Three Letter Words with definitions [home, info]
36. psi: The Skeptic's Dictionary [home, info]
37. PSI: AbbreviationZ [home, info]

Science (2 matching dictionaries)

38. PSI: Material Safety Data Sheets HyperGlossary [home, info]
39. PSI: Extragalactic Astronomy [home, info]

Slang (1 matching dictionary)

40. P.S.I. (Private Stripper Information), PSI: Urban Dictionary [home, info]

Sports (1 matching dictionary)

41. PSI (Pounds/Square Inch): Bicycle Glossary [home, info]

Tech (10 matching dictionaries)

42. PSI: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING [home, info]
43. PSI: AUTOMOTIVE TERMS [home, info]
44. PSI, psi: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]
45. PSI: Glossary of Meteorology [home, info]
46. PSI: Glossary of Common Hearth and Heating Terms [home, info]
47. psi: The Stamp Store Glossary (concrete) [home, info]
48. PSI: Glossary of Landscape Irrigation Terms [home, info]
49. psi, psi, psi: Oil Analysis [home, info]
50. Psi: Glossary of Energy Terms [home, info]
51. PSI: Power Engineering [home, info]

(Note: See psis for more definitions.)

Quick definitions from WordNet (psi) ▸ noun:  the 23rd letter of the Greek alphabet ▸ noun:  a unit of pressure ▸ Also see psis ▸ Words similar to psi ▸ Usage examples for psi ▸ Popular adjectives describing psi ▸ Words that often appear near psi ▸ Rhymes of psi ▸ Invented words related to psi