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We found 33 dictionaries with English definitions that include the word thorium: Click on the first link on a line below to go directly to a page where "thorium" is defined. General (24 matching dictionaries) thorium: American Heritage Dictionary of the English Language [home, info] thorium: Collins English Dictionary [home, info] thorium: Vocabulary.com [home, info] thorium: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Thorium, thorium: Wordnik [home, info] Thorium: Wiktionary [home, info] thorium: Compact Oxford English Dictionary [home, info] thorium: Webster's New World College Dictionary, 4th Ed. [home, info] thorium: The Wordsmyth English Dictionary-Thesaurus [home, info] thorium: Infoplease Dictionary [home, info] thorium: Dictionary.com [home, info] thorium: Online Etymology Dictionary [home, info] thorium: UltraLingua English Dictionary [home, info] Thorium: Wikipedia, the Free Encyclopedia [home, info] Thorium: Online Plain Text English Dictionary [home, info] thorium: Webster's Revised Unabridged, 1913 Edition [home, info] thorium: Rhymezone [home, info] Thorium: AllWords.com Multi-Lingual Dictionary [home, info] Thorium: 1911 edition of the Encyclopedia Britannica [home, info] thorium: Free Dictionary [home, info] thorium: Mnemonic Dictionary [home, info] thorium: WordNet 1.7 Vocabulary Helper [home, info] thorium: LookWAYup Translating Dictionary/Thesaurus [home, info] thorium: Dictionary/thesaurus [home, info] Business (2 matching dictionaries) Thorium: Energy Dictionary [home, info] thorium: Financial dictionary [home, info] Computing (1 matching dictionary) thorium: Encyclopedia [home, info] Medicine (3 matching dictionaries) Thorium: Medical Dictionary [home, info] thorium: online medical dictionary [home, info] thorium: Medical dictionary [home, info] Science (2 matching dictionaries) Thorium: Extragalactic Astronomy [home, info] Thorium, thorium: WebElements Periodic Table of the Elements [home, info] Tech (1 matching dictionary) thorium: Schlumberger Oilfield Glossary [home, info]

Quick definitions from WordNet (thorium) ▸ noun:  a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands ▸ Word origin