Roccellic
Roccellic , adjective
[French roccellique, from roccelle archil, Italian & New Latin roccella, from Italian rocca a rock, because archil grows on rock.]
(Chemistry) Pertaining to, or designating, a dibasic acid of the oxalic series found in archil (Roccella tinctoria, etc.), and other lichens, and extracted as a white crystalline substance C17H32O4.