AU
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Au
The symbol for gold.
[From Latin aurum, gold.]
AU
abbr.
astronomical unit
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
au
the internet domain name for
(Computer Science) Australia
Au
the chemical symbol for
(Elements & Compounds) gold
[from New Latin aurum]
AU
abbreviation for
1. (Placename) African Union
2. (General Physics) Also: a.u. angstrom unit
3. (Astronomy) Also: a.u. astronomical unit
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
AU
astronomical unit.
Au
1. Also,
au.
author. 2. Chem. Symbol. gold.
[< Latin aurum]
A.U.
or a.u.,
angstrom unit.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Au
The symbol for gold.
AU
Abbreviation of astronomical unit
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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| Noun | 1. |  Au - 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 regiagold foil - foil made of gold gold leaf - a very thin form of gold foil gold - coins made of gold noble metal - any metal that is resistant to corrosion or oxidation 24-karat gold, pure gold - 100 per cent gold gold dust - the particles and flakes (and sometimes small nuggets) of gold obtained in placer mining dental gold - an alloy of gold used in dentistry green gold - a gold alloy (at least 14 karat gold with silver or silver and cadmium) that has a green appearance guinea gold - 22-karat gold from which guinea coins were made graphic tellurium, sylvanite - a silver-white mineral consisting of silver gold telluride; a source of gold in Australia and America |
| 2. |  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 |
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