[mass noun]an aromatic gum resin obtained from an African tree and burnt as incense 乳香。 亦称 olibanum, gum olibanum
This resin is obtained from the tree Boswellia sacra, family Burseraceae, native to Somalia 这种树脂提取自乳香树,橄榄科: 索马里土生
语源
late Middle English: from Old French franc encens, literally 'high-quality incense', from franc (see frank) in an obsolete sense 'superior, of high quality' (which also existed in English) + encens 'incense'