litmus

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litmus

 [lit´mus]
a blue pigment prepared from Rocella tinctoria and other lichens.
litmus paper absorbent paper impregnated with a solution of litmus, dried and cut into strips. It is used to indicate the acidity or alkalinity of solutions. If dipped into alkaline solution it remains blue; acid solution turns it red. It is used to test urine and other body fluids; it has a pH range of 4.5 to 8.3.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lit·mus

(lit'mŭs), [old C.I. 1242]
A blue coloring matter obtained from Roccella tinctoria and other species of lichens, the principal component of which is azolitmin; used as an indicator (reddened by acids and turned blue again by alkalies).
[a corruption of lacmus, fr. Dutch lakmoes]
Farlex Partner Medical Dictionary © Farlex 2012

lit·mus

(lit'mŭs)
A blue coloring material obtained from Roccella tinctoria and other lichens, the principal component of which is azolitmin; used as an indicator (reddened by acids and turned blue again by alkalies).
[a corruption of lacmus, fr. Dutch lakmoes]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

litmus

A powder derived from certain lichens that contains the natural dye azolitmin. This turns red in an acidic medium at pH below 4.5 and blue at an alkaline pH above 8.3. Paper strips impregnated with litmus form convenient indicators for checking urine acidity.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005