An ingredient of the sacred incense, whose fragrance perfumed the sanctuary alone, Exodus 30:34 . It is conjectured to mean the Blatta Bryzantina of the shops; an article which consists of the cover or lid of a species of muscle, and when burnt emits a musky odor. The best onycha is found in the Red Sea, and is white and large.
Although written in 1859 by William Rand, this dictionary of the Bible from the American Tract Society is still relevant today.Wikipedia
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