litmus

  1. Noun.  (uncountable) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels.
  2. Noun.  A simple test of acidity in a liquid using litmus, usually in the form of litmus paper.
  3. Noun.  A simple test of any attribute; a litmus test.

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This entry was last updated on RefTopia from its source on 3/20/2012.