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Litmus: A mixture of pigments extracted from certain lichens that turns blue in basic solution and red in acidic solution.

Litmus Paper: Paper impregnated with litmus, usually cut in narrow strips. Dipping red litmus paper into a basic solution turns it blue; dipping blue litmus paper into an acidic solution turns it red.

Metadrama: Drama in which the subject of the play is dramatic art itself, especially when such material breaks up the illusion of watching reality. When Macbeth cries out, 'Life's but a walking shadow, . . . View Full Definition