English dictionary



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English noun: Au

1. Au (substance) 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


Synonymsatomic number 79, gold


Broader (hypernym)noble metal


Narrower (hyponym)24-karat gold, gold dust, green gold, guinea gold, pure gold


Substance meronymdental gold, gold, gold foil, gold leaf, graphic tellurium, sylvanite

2. AU (quantity) 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)


SynonymsAstronomical Unit


Broader (hypernym)astronomy unit









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