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]