litmus
lit·mus
noun \ˈlit-məs\Definition of LITMUS
1
: a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator
2
: the critical factor in a litmus test; also : litmus test
Origin of LITMUS
Middle English litmose, of Scandinavian origin; akin to Old Norse litmosi herbs used in dyeing, from litr color (akin to Old English wlite brightness, appearance) + mosi moss; akin to Old English mōs moss
First Known Use: 14th century
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