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Litmus

//ˈlɪtməs// noun

Definitions

Noun
  1. 1
    A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels. uncountable
  2. 2
    a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator wordnet
  3. 3
    A simple test of acidity in a liquid using litmus, usually in the form of litmus paper. countable, uncountable
  4. 4
    A simple test of any attribute; a litmus test. countable, uncountable

Etymology

From Middle English litmose, lytmose, litemose, from Old Norse litmosi (“moss used for dyeing”), from lita (“to dye, stain”) + mosi (“moss”), the former from litr (“colour, dye, blee”), from Proto-Germanic *wlitiz, *wlituz (“appearance, blee”), from Proto-Indo-European *wel- (“to see”). Cognate with Old English wlite (“appearance, form, brightness, countenance”). More at moss.

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