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Missouri, Show Me State, MO | a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union | ||
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moment, minute, second, bit, mo | an indefinitely short time | ||
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molybdenum, Mo, atomic number 42 | a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel |