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.
Lion's tail
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A genus of labiate plants (Leonurus); -- so called from
a fancied resemblance of its flower spikes to the tuft of a lions
tail. L. Cardiaca is the common motherwort.
Lion's tail meaning & definition 1 of Lion's tail.
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