AU
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  Au
       n 1: a soft yellow malleable ductile (trivalent and univalent)
            metallic element; occurs mainly as nuggets in rocks and
            alluvial deposits; does not react with most chemicals
            but is attacked by chlorine and aqua regia [syn: gold,
             atomic number 79]
       2: a unit of length used for distances within the solar system;
          equal to the mean distance between the Earth and the Sun
          (approximately 93 million miles or 150 million kilometers)
          [syn: Astronomical Unit]