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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 white paper treated with litmus, used in chemistry as an indicator of acidity and alkalinity.
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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See
  chemistry