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]