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Dictionary

lit•mus

Pronunciation: (lit'mus), [key]
—n.
a blue coloring matter obtained from certain lichens, esp. Roccella tinctoria. In alkaline solution litmus turns blue, in acid solution, red: widely used as a chemical indicator.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

litigious

litmus paper

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