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 |
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| Synonyms | atomic number 79, gold |
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| Broader (hypernym) | noble metal |
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| Narrower (hyponym) | 24-karat gold, gold dust, green gold, guinea gold, pure gold |
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| Substance meronym | dental gold, gold, gold foil, gold leaf, graphic tellurium, sylvanite |
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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) |
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| Synonyms | Astronomical Unit |
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| Broader (hypernym) | astronomy unit |
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