| 单词 | litmus |
| 释义 | litmus (once / 11879 pages) n Litmus is a special dye that's used to determine how acidic a substance is. Scientists use litmus to test liquids or gases to see if they're an acid or a base. Litmus is the mix of dyes that's used to make litmus paper, a scientific tool that makes it easy to see if a material has an acidic pH. Made from lichen, litmus can be absorbed onto paper which turns blue to indicate an alkaline substance and red if it's acidic. Litmus comes from the Middle Dutch word lijkmoes, which combines lac, "red resinous substance" and moes, "pulp." WORD FAMILYlitmus USAGE EXAMPLES“Merry Christmas” is an expression of goodwill, not a litmus test for determining who does, or does not, support a Christian religion. Washington Post(Dec 28, 2016) Specificity would still be needed for, say, pollution discharge limits, but the litmus test should be whatever achieves the desired results. Washington Post(Dec 13, 2016) The next few years, and the rise of a new generation of filmmakers, will be the litmus test for the arrival of streaming. The New Yorker(Dec 06, 2016) n 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 Syn|Hyper litmus test acid-base indicator an indicator that changes color on going from acidic to basic solutions |
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