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.
Tracing
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The act of one who traces; especially, the act of copying
by marking on thin paper, or other transparent substance, the lines of
a pattern placed beneath; also, the copy thus producted.
Tracing meaning & definition 1 of Tracing.
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Tracing in Roller skating. The path that the skating foot takes on the surface.
Tracing meaning & definition 2 of Tracing.
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