litmus

4 ENTRIES FOUND:

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

lit·mus

noun \ˈlit-məs\   (Medical Dictionary)

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

litmus

noun    (Concise Encyclopedia)

Mixture of coloured organic compounds obtained from several species of lichens. In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a base. It turns red or pink in acid solutions and blue or purple-blue in alkaline solutions.

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