a strip of paper impregnated with litmus, used as a chemical indicator.
Origin of litmus paper
First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for litmus paper
Litmus-paper, indigo blue or other vegetable colours are at once bleached.
If the litmus-paper turns red the man is dead; if it remains blue he is alive.The Ethics of Medical Homicide and Mutilation|Austin O'Malley
Hypochlorous acid first reddens, and then bleaches, litmus-paper.
Medicine definitions for litmus paper
An unsized white paper impregnated with litmus and used as a pH or acid-base indicator.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.