Usually means: Underwater structure formed by corals.
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We found 45 dictionaries that define the word reef:

General (29 matching dictionaries)
  1. reef: Longman Dictionary of Contemporary English
  2. reef: Merriam-Webster
  3. reef, reef: Oxford Learner's Dictionaries
  4. reef, reef: American Heritage Dictionary of the English Language
  5. reef, the Reef: Collins English Dictionary
  6. Reef, reef: Vocabulary.com
  7. Reef, reef: Wordnik
  8. reef: Cambridge Advanced Learner's Dictionary
  9. reef: Wiktionary
  10. reef: Webster's New World College Dictionary, 4th Ed.
  11. reef: The Wordsmyth English Dictionary-Thesaurus
  12. reef: Infoplease Dictionary
  13. reef: Dictionary.com
  14. reef (1), reef (2): Online Etymology Dictionary
  15. reef: Cambridge Essential American English Dictionary
  16. Reef (band), Reef (company), Reef (disambiguation), Reef (novel), Reef, The Reef (disambiguation), The Reef (novel), The Reef: Wikipedia, the Free Encyclopedia
  17. Reef: Online Plain Text English Dictionary
  18. reef: Webster's Revised Unabridged, 1913 Edition
  19. reef: Rhymezone
  20. reef, reef: AllWords.com Multi-Lingual Dictionary
  21. reef: Webster's 1828 Dictionary
  22. Reef: Dictionary of Phrase and Fable (1898)
  23. reef: FreeDictionary.org
  24. reef: The Phrontistery - A Dictionary of Obscure Words
  25. reef: Mnemonic Dictionary
  26. reef: TheFreeDictionary.com
  27. reef: Wikimedia Commons US English Pronunciations

Computing (1 matching dictionary)
  1. reef: Encyclopedia

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Reef (knot), Reef (sail), reef: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Brilliant Dream Dictionary (No longer online)
  3. REEF: Acronym Finder
  4. Reef: Idioms

Science (1 matching dictionary)
  1. reef: Natural History Terms

Slang (3 matching dictionaries)
  1. reef, reef, reef, reef: Green’s Dictionary of Slang
  2. Reef: Dublin Slang and Phrasebook
  3. reef: Urban Dictionary

Tech (4 matching dictionaries)
  1. Lake and Water Word Glossary (No longer online)
  2. Schlumberger Oilfield Glossary (No longer online)
  3. SeaTalk Dictionary of English Nautical Language (No longer online)
  4. Sandahl, Middle English Sea Terms (No longer online)

(Note: See reefed as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A chain or range of rocks, sand, or coral lying at or near the surface of the water.
noun:  (Australia, South Africa) A large vein of auriferous quartz; hence, any body of rock yielding valuable ore.
noun:  (nautical) A portion of a sail rolled and tied down to lessen the area exposed in a high wind.
noun:  A reef knot.
verb:  (nautical) To take in part of a sail in order to adapt the size of the sail to the force of the wind.
verb:  (Australia) To pull or yank strongly, especially in relation to horse riding.
verb:  (nautical, of paddles) To move the floats of a paddle wheel toward its center so that they will not dip so deeply.
verb:  (slang) To manipulate the lining of a person's pocket in order to steal the contents unnoticed.
adjective:  Scabby; scurvy.
noun:  (Now chiefly dialectal) The itch; any eruptive skin disorder.
noun:  (Now chiefly dialectal) Dandruff.
noun:  A surname from German.

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    turquoise,     aqua,     coral,     seafoam,     teal, more...



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Colors:
    turquoise,     aqua,     coral,     seafoam,     teal, more...



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