Litmus test definition: the use of litmus paper or solution to test the acidity or alkalinity of a solution.. See examples of LITMUS TEST used in a sentence.
Marburger, a lifelong Democrat, said his appointment was demonstrative proof that the administration didn't employ a political litmus test before approving membership on government scientific advisory panels. Suspicious science The neocons tried to make contra aid (on which Clinton apparently never took...
Clinton vow on Roe examined anew Supreme Court watchers speculate on meaning of a litmus test on abortionDick Lehr, Globe Staff