Definitions for



Overview of noun au

The noun au has 2 senses? (no senses from tagged texts)
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)

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))

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