1. American Ornithologists' Union.

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How to use A.O.U. in a sentence

  • The correct position of the tongue, preparatory to singing, is gained by saying the vowel sound aou, as if about to yawn.

    How to Sing | Lilli Lehmann
  • After passing all these places, they came to a country named Ma-t'aou-lo.

  • Those little cats in the AOU have done the meanest thing you can think of.

    Cloudy Jewel | Grace Livingston Hill