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.
Light-headed
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Thoughtless; heedless; volatile; unsteady; fickle;
loose.
Light-headed meaning & definition 1 of Light-headed.
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If you feel light-headed, you feel weak and as if you are going to lose your balance:
Light-headed meaning & definition 2 of Light-headed.
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