Skip to Content
Medical Term:


Pronunciation: lit'mus

Definition: 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]

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.