See Also: usnic(medicine)
usnic(dictionary)
usnic acid(medicine)
usnic (iou)
usnic adjective. M19.
[from USNEA + -IC.]
Chemistry. usnic acid, a yellow tricyclic crystalline solid, C18H16O7, which is present in many lichens and is used as an antibiotic.
usnin noun usnic acid M19.
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