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usnic acid

[uhs-nik]
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noun Pharmacology.
  1. an antibacterial substance, C18H16O7, derived from lichens of the genus Usnea.
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Origin of usnic acid

1840–50; < New Latin Usn(ea) usnea + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018