Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun au

2 senses of au

Sense 1
gold, Au, atomic number 79 -- (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)
       => noble metal -- (any metal that is resistant to corrosion or oxidation)

Sense 2
Astronomical Unit, AU -- (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))
       => astronomy unit -- (a linear unit used for astronomical distances)