litmus

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English

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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.

Pronunciation

Noun

litmus (countable and uncountable, plural litmuses)

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

Synonyms

  • (dyestuff from lichen): lacmus

Derived terms

Translations

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