An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Water ouzel
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Any one of several species of small insessorial birds of
the genus Cinclus (or Hydrobates), especially the European water ousel
(C. aquaticus), and the American water ousel (C. Mexicanus). These
birds live about the water, and are in the habit of walking on the
bottom of streams beneath the water in search of food.
Water ouzel meaning & definition 1 of Water ouzel.
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