WordReference Random House Unabridged Dictionary of American English © 2020
au  (ō),USA pronunciation pl.  aux (ō),USA pronunciation [French.]
  1. Foreign Termsto the;
    at the;
    with the. Cf. à la.

AU, 
  • AstronomySee  astronomical unit. 

  • Au, 
    1. AbbreviationsAlso,  au. author.
    2. Chemistry[Symbol, Chem.]gold.
    • Latin aurum

    A.U., 
  • Physics, Weights and Measuresangstrom unit.
  • Also,  a.u. 
    WordReference Random House Unabridged Dictionary of American English © 2020
    Au, +
  • Abbreviationsauthor.
  • Also,  au. 
    Collins Concise English Dictionary © HarperCollins Publishers::
    Au the chemical symbol for
    1. gold
    Etymology: from New Latin aurum
    'au' also found in these entries:
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