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usnic acid

[uhs-nik] /ˈʌs nɪk/
noun, Pharmacology
1.
an antibacterial substance, C 18 H 16 O 7 , derived from lichens of the genus Usnea.
Origin
1840-1850
1840-50; < Neo-Latin Usn(ea) usnea + -ic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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