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.
Time signature
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A sign at the beginning of a composition or movement, placedafter the key signature, to indicate its time or meter. Also calledrhythmical signature. It is in the form of a fraction, of which thedenominator indicates the kind of note taken as time unit for thebeat, and the numerator, the number of these to the measure.
Time signature meaning & definition 1 of Time signature.
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