litmus test lit·mus·test uncommon noun 1. a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator Synonymslitmuslitmus test 2. a test that relies on a single indicator “her litmus test for good breeding is whether you split infinitives” Synonymslitmus test Related words Broader terms examinationacid-base indicator Parts litmus paper WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
