Usually means: Prefix meaning three or triple.
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We found 39 dictionaries that define the word TRI:

General (25 matching dictionaries)
  1. tri: Longman Dictionary of Contemporary English
  2. tri-: Merriam-Webster
  3. tri-: Oxford Learner's Dictionaries
  4. tri-: American Heritage Dictionary of the English Language
  5. tri-, tri-: Collins English Dictionary
  6. Tri, tri, tri-: Wordnik
  7. tri-: Cambridge Advanced Learner's Dictionary
  8. TRI, tri, tri-: Wiktionary
  9. tri-: Webster's New World College Dictionary, 4th Ed.
  10. tri-: The Wordsmyth English Dictionary-Thesaurus
  11. tri-: Infoplease Dictionary
  12. TRI, tri-: Dictionary.com
  13. tri-: Online Etymology Dictionary
  14. Tri-, Tri: Wikipedia, the Free Encyclopedia
  15. Tri-: Online Plain Text English Dictionary
  16. tri-: Webster's Revised Unabridged, 1913 Edition
  17. Tri: Rhymezone
  18. Tri-: AllWords.com Multi-Lingual Dictionary
  19. tri: Webster's 1828 Dictionary
  20. tri, tri-: MyWord.info
  21. TRI, Tri: Stammtisch Beau Fleuve Acronyms
  22. tri-: FreeDictionary.org
  23. tri, tri-: TheFreeDictionary.com

Art (1 matching dictionary)
  1. tri-: A Cross Reference of Latin and Greek Elements

Business (1 matching dictionary)
  1. TRI: Deardorff's Glossary of International Economics

Medicine (3 matching dictionaries)
  1. ABTA Brain Tumor Patients (No longer online)
  2. online medical dictionary (No longer online)
  3. tri-: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. TRI: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (4 matching dictionaries)
  1. tri: Dictionary of Botanical Epithets
  2. Botanical Terms (No longer online)
  3. Flora of New South Wales (No longer online)
  4. Glossary of Roots of Botanical Names (No longer online)

Slang (2 matching dictionaries)
  1. tri: Green’s Dictionary of Slang
  2. tri: Urban Dictionary

Tech (1 matching dictionary)
  1. TRI: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING

Google, News, Images, Wikipedia, Reddit, BlueSky
Definitions from Wiktionary (TRI)

▸ noun:  (chiefly attributive) triathlon
▸ noun:  (computer graphics) triangle
▸ noun:  (bodybuilding, colloquial, uncommon) triceps
▸ noun:  A surname from Vietnamese.
▸ noun:  Initialism of Toxic Release Inventory.
▸ noun:  (artificial intelligence, US) Initialism of Toyota Research Institute.
▸ noun:  Initialism of Triple Reuptake Inhibitor.

Similar:
time-tested, reliable, dependable, well-tried, proven, tried and true, Tested, triatic, trionym, triad, more...

Opposite:
mono, uni, single

Types:
right, acute, obtuse, equilateral, isosceles, scalene, more...

Phrases:
tri city, tri star, Tri Delt, tri valley, tri iodothyronine, more...

Adjectives:
quang, viet, first, great, clinical, thieu, western, total, equilateral, similar, acme

Colors:
    turquoise,     teal,     tangerine,     taupe,     thistle, more...


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▸ Rhymes of TRI

▸ Invented words related to TRI

Similar:
time-tested, reliable, dependable, well-tried, proven, tried and true, Tested, triatic, trionym, triad, more...

Opposite:
mono, uni, single

Types:
right, acute, obtuse, equilateral, isosceles, scalene, more...

Phrases:
tri city, tri star, Tri Delt, tri valley, tri iodothyronine, tri state, tri iodomethane, tri chad, tri band, tri cities, tri tac, tri axle, tri nations, tri rail, tri shield, tri tip, zithromax tri pak, Tri Repetae, more...

Adjectives:
quang, viet, first, great, clinical, thieu, western, total, equilateral, similar, acme

Colors:
    turquoise,     teal,     tangerine,     taupe,     thistle, more...



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