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We found 42 dictionaries with English definitions that include the word keystone: Click on the first link on a line below to go directly to a page where "keystone" is defined. General (30 matching dictionaries) keystone: American Heritage Dictionary of the English Language [home, info] keystone: Collins English Dictionary [home, info] keystone: Vocabulary.com [home, info] keystone: Macmillan Dictionary [home, info] keystone: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Keystone, keystone: Wordnik [home, info] keystone: Cambridge Advanced Learner's Dictionary [home, info] Keystone: Wiktionary [home, info] keystone: Compact Oxford English Dictionary [home, info] keystone: Webster's New World College Dictionary, 4th Ed. [home, info] keystone: The Wordsmyth English Dictionary-Thesaurus [home, info] keystone: Infoplease Dictionary [home, info] Keystone, keystone: Dictionary.com [home, info] keystone: Online Etymology Dictionary [home, info] Keystone, keystone: UltraLingua English Dictionary [home, info] Keystone (Amtrak), Keystone (Maine), Keystone (album), Keystone (architecture), Keystone (asterism), Keystone (astronomy), Keystone (automobile), Keystone (beer), Keystone (beer brand), Keystone (cask), Keystone (disambiguation), Keystone (gasoline automobile), Keystone (limestone), Keystone (passenger train), Keystone (steam automobile), Keystone (train), Keystone (video game), Keystone: Wikipedia, the Free Encyclopedia [home, info] Keystone: Online Plain Text English Dictionary [home, info] keystone: Webster's Revised Unabridged, 1913 Edition [home, info] keystone: Rhymezone [home, info] keystone: AllWords.com Multi-Lingual Dictionary [home, info] keystone: Webster's 1828 Dictionary [home, info] Keystone: 1911 edition of the Encyclopedia Britannica [home, info] keystone: Free Dictionary [home, info] keystone: The Phrontistery - A Dictionary of Obscure Words [home, info] keystone: Mnemonic Dictionary [home, info] keystone: WordNet 1.7 Vocabulary Helper [home, info] keystone: LookWAYup Translating Dictionary/Thesaurus [home, info] keystone: Dictionary/thesaurus [home, info] Art (4 matching dictionaries) keystone: ArtLex Lexicon of Visual Art Terminology [home, info] KEYSTONE: The Britannia Lexicon (Middle Ages Glossary) [home, info] Keystone: Glossary: Gothic Art and Architecture [home, info] keystone: Glossary of Medieval Art and Architecture [home, info] Business (2 matching dictionaries) Keystone: MoneyGlossary.com [home, info] Keystone (disambiguation), Keystone (passenger train), Keystone (train), keystone: Legal dictionary [home, info] Computing (2 matching dictionaries) keystone: CCI Computer [home, info] Keystone (disambiguation), Keystone (passenger train), Keystone (train), keystone: Encyclopedia [home, info] Miscellaneous (1 matching dictionary) Keystone: Castle Terms [home, info] Slang (1 matching dictionary) keystone: Urban Dictionary [home, info] Tech (2 matching dictionaries) Keystone: Glossary of video terms [home, info] Keystone: Urban Conservation Glossary [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (keystone) ▸ noun:  the central building block at the top of an arch or vault ▸ noun:  a central cohesive source of support and stability ("The keystone of campaign reform was the ban on soft money") ▸ Word origin