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.
Pearlstone
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A glassy volcanic rock of a grayish color and pearly
luster, often having a spherulitic concretionary structure due to the
curved cracks produced by contraction in cooling. See Illust. under
Perlitic.
Pearlstone meaning & definition 1 of Pearlstone.
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[Person] who makes their [mother] do [everything].
Pearlstone meaning & definition 2 of Pearlstone.
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A greyish glassy volcanic rock characterized by concentric spheroidal cracks.
Pearlstone meaning & definition 3 of Pearlstone.
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