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litmus paper

litmus paper

 
pronunciation:
lIt ms peI pr
features:
Word History, Word Explorer
part of speech: noun
definition: a small strip of treated paper used in chemistry. Litmus paper turns red in an acid and blue in a base.
Word History
The word "litmus" comes from early Scandinavian words that mean "drip" and "moss." Litmus is a blue dye obtained from lichen plants. The term litmus paper was first used in 1803.
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  chemistry