from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to, or designating, an organic acid which is obtained from several varieties of lichen (Lecanora, Roccella, etc.), as a white, crystalline substance, and is called also orsellic acid, diorsellinic acid, lecanorin, etc.
from The Century Dictionary and Cyclopedia
- Related to or derived from plants of the genus Lecanora.
Sorry, no etymologies found.
On the other hand, the constitution of the simpler natural tannoids is known to a greater or less extent; of these, lecanoric acid (Lecanorsäure) is the best known, being an ester anhydride of orsellic acid (a dihydroxytoluylic acid).