Frankfortblack
n.
A fragrant, aromatic resin, or gum resin, burned as an incense in religious rites or for medicinal fumigation. The best kinds now come from East Indian trees, of the genus Boswellia ; a commoner sort, from the Norway spruce ( Abies excelsa ) and other coniferous trees. The frankincense of the ancient Jews is still unidentified.
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