Litmus-paper definition

An unsized white paper impregnated with litmus and used as a pH or acid-base indicator.
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Absorbent paper treated with litmus and used as an acid-base indicator.
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Paper containing a water-soluble mixture of different dyes extracted from certain lichens. The resulting piece of paper is used to test materials for acidity.
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Other Word Forms

Noun

Singular:
litmus-paper
Plural:
litmus papers