tornasole

Etymology
. Compare Modern. The sense “litmus” originated by the substance originally being taken from said plant. Compare 🇨🇬 and 🇨🇬.

Noun

 * 1)   sunflower
 * 2)  turnsole
 * 3)   litmus (substance)
 * 1)  turnsole
 * 2)   litmus (substance)