Dictionary

litmus

noun lit·mus \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
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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
Medical Dictionary

litmus

noun lit·mus \ˈlit-məs\

Medical Definition of LITMUS

:  a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator

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