Usually means: Substance that donates hydrogen ions.
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We found 75 dictionaries that define the word acid:

General (29 matching dictionaries)
  1. acid: Merriam-Webster.com
  2. acid: Oxford Learner's Dictionaries
  3. acid: American Heritage Dictionary of the English Language
  4. acid: Collins English Dictionary
  5. acid: Vocabulary.com
  6. acid, acid: Wordnik
  7. acid: Cambridge Advanced Learner's Dictionary
  8. ACID, acid: Wiktionary
  9. acid: Webster's New World College Dictionary, 4th Ed.
  10. acid: The Wordsmyth English Dictionary-Thesaurus
  11. acid: Infoplease Dictionary
  12. ACID: Dictionary.com
  13. acid: Online Etymology Dictionary
  14. acid: Cambridge Essential American English Dictionary
  15. ACID (computer science), ACID, ACiD, Acid (band), Acid (chemistry), Acid (disambiguation), Acid (drug), Acid (film), Acid (hip-hop), Acid (hip hop group), Acid, The Acid: Wikipedia, the Free Encyclopedia
  16. Acid: Online Plain Text English Dictionary
  17. acid: Webster's Revised Unabridged, 1913 Edition
  18. acid: Rhymezone
  19. acid: AllWords.com Multi-Lingual Dictionary
  20. acid: Webster's 1828 Dictionary
  21. ACID, acid: Stammtisch Beau Fleuve Acronyms
  22. acid: Free Dictionary
  23. acid: Mnemonic Dictionary
  24. acid: Dictionary/thesaurus
  25. acid: Wikimedia Commons US English Pronunciations
  26. Acid (computer virus): Wikipedia, the Free Encyclopedia
  27. Acid: Wordnik

Art (6 matching dictionaries)
  1. acid: ArtLex Lexicon of Visual Art Terminology
  2. Acid: Health & Beauty Glossary
  3. Epicurus.com Cheese Glossary (No longer online)
  4. Epicurus.com Coffee Glossary (No longer online)
  5. acid-: A Cross Reference of Latin and Greek Elements
  6. Glossary of Stamp Collecting Terms (No longer online)

Business (3 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. Acid (chemistry), acid: Legal dictionary
  3. BusinessDictionary.com (No longer online)

Computing (3 matching dictionaries)
  1. ACID: Free On-line Dictionary of Computing
  2. Webopedia (No longer online)
  3. Acid (chemistry), Acid (drug), Acid (electronic music), acid: Encyclopedia

Medicine (7 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Acid: Merck Manuals
  3. online medical dictionary (No longer online)
  4. Hair Facts (No longer online)
  5. acid: Dictionary of Cancer Terms
  6. Acid (chemistry), Acid (drug), acid, acid-: Medical dictionary
  7. PERFUSION TECHNOLOGY, OPEN HEART SURGERY AND CARDIOLOGY (No longer online)

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

Science (7 matching dictionaries)
  1. Electrochemistry Dictionary (No longer online)
  2. Chemistry Dictionary (No longer online)
  3. Acid: Eric Weisstein's World of Chemistry
  4. acid: PHYSICAL ORGANIC CHEMISTRY
  5. Acid: Material Safety Data Sheets HyperGlossary
  6. Fishkeeping glossary (No longer online)
  7. acid: UNCChem Glossary

Slang (4 matching dictionaries)
  1. acid, acid: Green’s Dictionary of Slang
  2. acid: English slang and colloquialisms used in the United Kingdom
  3. Totally Unofficial Rap (No longer online)
  4. Acid: Street Terms: Drugs and the Drug Trade

Tech (11 matching dictionaries)
  1. Book Binding (No longer online)
  2. AUTOMOTIVE TERMS (No longer online)
  3. Acid: Glossary of Cheese Terms
  4. acid: Construction deterioration & building durability glossary
  5. Acid: Beauty & Health Glossary
  6. Glossary of Coffee Terminology (No longer online)
  7. Lake and Water Word Glossary (No longer online)
  8. Oil Analysis (No longer online)
  9. Schlumberger Oilfield Glossary (No longer online)
  10. ACID: Power Engineering
  11. Water-Science Glossary of Terms (No longer online)

(Note: See aciding as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
adjective:  (figuratively) Sour-tempered.
adjective:  Of or pertaining to an acid; acidic.
adjective:  (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
noun:  A sour substance.
noun:  (chemistry)
noun:  Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid.
noun:  Any compound that easily donates protons to a base; a Brønsted acid.
noun:  Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid.
noun:  Any corrosive substance.
noun:  (uncountable, slang) LSD, lysergic acid diethylamide.
noun:  (databases) Acronym of atomicity, consistency, isolation, and durability, a set of properties that guarantee database transactions are processed reliably. [(countable, chemistry)]

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