Usually means: Three-lobed shape or design.
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We found 33 dictionaries that define the word trefoil:

General (22 matching dictionaries)
  1. trefoil: Merriam-Webster.com
  2. trefoil: Oxford Learner's Dictionaries
  3. trefoil: American Heritage Dictionary of the English Language
  4. trefoil: Collins English Dictionary
  5. trefoil: Vocabulary.com
  6. Trefoil, trefoil: Wordnik
  7. trefoil: Wiktionary
  8. trefoil: Webster's New World College Dictionary, 4th Ed.
  9. trefoil: The Wordsmyth English Dictionary-Thesaurus
  10. trefoil: Infoplease Dictionary
  11. trefoil: Dictionary.com
  12. trefoil: Online Etymology Dictionary
  13. Trefoil (disambiguation), Trefoil: Wikipedia, the Free Encyclopedia
  14. Trefoil: Online Plain Text English Dictionary
  15. trefoil: Webster's Revised Unabridged, 1913 Edition
  16. trefoil: Rhymezone
  17. Trefoil: AllWords.com Multi-Lingual Dictionary
  18. trefoil: Webster's 1828 Dictionary
  19. trefoil: Free Dictionary
  20. trefoil: The Phrontistery - A Dictionary of Obscure Words
  21. trefoil: Mnemonic Dictionary
  22. trefoil: Dictionary/thesaurus

Art (4 matching dictionaries)
  1. TREFOIL: The Britannia Lexicon (Middle Ages Glossary)
  2. An Illustrated Dictionary of Jewelry (No longer online)
  3. Epicurus.com Sushi Glossary (No longer online)
  4. trefoil: Glossary of Medieval Art and Architecture

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)
  1. trefoil: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. trefoil: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. Trefoil: Castle Terms

Slang (1 matching dictionary)
  1. trefoil: Urban Dictionary

Tech (1 matching dictionary)
  1. trefoil: Glossary of Medieval Architecture

(Note: See trefoils as well.)

Definitions from Wiktionary (trefoil)

noun:  Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.
noun:  A symbol having the shape of such leaves, especially when used as an architectural ornament.
noun:  (topology) Ellipsis of trefoil knot. [(topology) A knot formed by joining the two loose ends of a overhand knot to form a knotted loop; the simplest non-trivial knot.]

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