n :  a vesicant crystalline unsaturated acid C₅H₈O₂ with a spicy odor that is the stable stereoisomer of angelic acid and occurs in the form of esters esp. in chamomile oil from the common European chamomile (Anthemis nobilis) and in croton oil .
 
 
 
Similar sounding terms:  di·gal·lic acid 
 
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