Usually means: Reddish-brown metal, conducts electricity well.
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We found 68 dictionaries that define the word copper:

General (29 matching dictionaries)
  1. copper: Merriam-Webster
  2. copper, copper: Oxford Learner's Dictionaries
  3. copper, copper: American Heritage Dictionary of the English Language
  4. copper: Collins English Dictionary
  5. copper: Vocabulary.com
  6. Copper, copper: Wordnik
  7. copper: Cambridge Advanced Learner's Dictionary
  8. Copper, copper: Wiktionary
  9. copper: Webster's New World College Dictionary, 4th Ed.
  10. copper: The Wordsmyth English Dictionary-Thesaurus
  11. copper: Infoplease Dictionary
  12. copper: Dictionary.com
  13. copper: Online Etymology Dictionary
  14. copper: Cambridge Essential American English Dictionary
  15. Copper (OCS), Copper (TV series), Copper (color), Copper (comic), Copper (disambiguation), Copper (heraldry), Copper, The Copper: Wikipedia, the Free Encyclopedia
  16. Copper: Online Plain Text English Dictionary
  17. copper: Webster's Revised Unabridged, 1913 Edition
  18. copper: Rhymezone
  19. Copper: AllWords.com Multi-Lingual Dictionary
  20. copper: Webster's 1828 Dictionary
  21. COPPER: Dictionary of Americanisms (1848)
  22. Copper, Copper: Dictionary of Phrase and Fable (1898)
  23. copper: FreeDictionary.org
  24. copper: Mnemonic Dictionary
  25. copper: TheFreeDictionary.com
  26. copper: Wikimedia Commons US English Pronunciations
  27. copper: Longman Dictionary of Contemporary English

Art (2 matching dictionaries)
  1. copper: ArtLex Lexicon of Visual Art Terminology
  2. Epicurus.com Beer Glossary (No longer online)

Business (4 matching dictionaries)
  1. copper: Webster's New World Finance & Investment Dictionary
  2. Construction Term Glossary (No longer online)
  3. copper: Financial dictionary
  4. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. copper: Free On-line Dictionary of Computing
  2. Copper (element), copper: Encyclopedia

Medicine (7 matching dictionaries)
  1. copper: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. Copper: Merck Manuals
  5. online medical dictionary (No longer online)
  6. Hepatitis C Information Central (No longer online)
  7. Copper (element), copper: Medical dictionary

Miscellaneous (5 matching dictionaries)
  1. Encyclopedia of Graphic Symbols (No longer online)
  2. Brilliant Dream Dictionary (No longer online)
  3. COPPER: Acronym Finder
  4. AbbreviationZ (No longer online)
  5. copper: Idioms

Religion (2 matching dictionaries)
  1. Copper: Easton Bible
  2. Copper: Smith's Bible Dictionary

Science (4 matching dictionaries)
  1. Archaeology Wordsmith (No longer online)
  2. COPPER: The Mineral Gallery
  3. Copper: Extragalactic Astronomy
  4. copper: WebElements Periodic Table of the Elements

Slang (4 matching dictionaries)
  1. copper, copper, copper, copper: Green’s Dictionary of Slang
  2. copper: English slang and colloquialisms used in the United Kingdom
  3. Copper: Dublin Slang and Phrasebook
  4. Copper: Twists, Slugs and Roscoes: Hardboiled Slang

Sports (1 matching dictionary)
  1. Copper: Body Building

Tech (8 matching dictionaries)
  1. copper: Webster's New World Telecom Dictionary
  2. Metal Terminology (No longer online)
  3. AUTOMOTIVE TERMS (No longer online)
  4. Beer & Brewing Terminology (No longer online)
  5. Copper: Beauty & Health Glossary
  6. Copper: Glossary of Mining Terms
  7. Pool Glossary (No longer online)
  8. Urban Conservation Glossary (No longer online)

(Note: See coppered as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) A reddish-brown, malleable, ductile metallic element with high electrical and thermal conductivity, symbol Cu, and atomic number 29.
noun:  The reddish-brown colour / color of copper.
noun:  (countable, dated) Any of various specialized items that are made of copper, where the use of copper is either traditional or vital to the function of the item.
noun:  (countable) A copper coin, typically of a small denomination, such as a penny.
noun:  (UK, Australia, dated) A large pot, often used for heating water or washing clothes over a fire. In Australasia at least, it could also be a fixed installation made of copper, with a fire underneath and its own chimney. Generally made redundant by the advent of the washing machine.
noun:  (entomology) Any of various lycaenid butterflies with copper-coloured upperwings, especially those of the genera Lycaena and Paralucia.
adjective:  Made of copper.
adjective:  Having the reddish-brown colour/color of copper.
verb:  To sheathe or coat with copper.
noun:  (slang, law enforcement) A police officer.
noun:  A surname.

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Colors:
    copper,     bronze,     rust,     burnt sienna,     chestnut, more...



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Colors:
    copper,     bronze,     rust,     burnt sienna,     chestnut, more...



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