usnic acid
/ˈʌznɪk/noun
mass noun
1- Biochemistry a yellow crystalline compound which is present in many lichens and is used as an antibiotic【生化】松萝酸, 地衣酸。
1.1
- A tricyclic phenol; chem. formula: C18H16O7.一种三环苯酚; 化学分子式： C18H16O7.
词源
mid 19th cent.: usnic from medieval Latin usnea （from Arabic ushnah 'moss'） + -IC.