noun[mass noun] Biochemistry
A yellow crystalline compound which is present in many lichens and is used as an antibiotic.
- Bitter orange, aristolochic acid and usnic acid are all used for weight loss.
- Although several synthetic compounds inhibit this key pigment enzyme, the scientists found that usnic acid was over 10 times more effective than others tested.
- I don't know anyone else who's working on the toxicity of usnic acid besides me.
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