litmus

litmus definition - medical

lit·mus (lĭtˈməs)

noun
A water-soluble blue powder derived from lichens that changes to red with increasing acidity and to blue with increasing basicity.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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