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.
Knuckle
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The joining pars of a hinge through which the pin or rivetpasses; a knuckle joint.
Knuckle meaning & definition 1 of Knuckle.
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A part of a finger at a joint where the bone is near the surface, especially where the finger joins the hand.
Knuckle meaning & definition 2 of Knuckle.
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