litmus

باللغة العربية: عَبَّاد الشَّمْس، مِحَكّ

1. A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels. (uncountable)
2. A simple test of acidity in a liquid using litmus, usually in the form of litmus paper. (countable, uncountable)
3. A simple test of any attribute; a litmus test. (countable, uncountable)

الجمع litmuses