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Easton's Bible Dictionary
A nail; claw; hoof, (Heb. sheheleth; Exodus 30:34
), a Latin word applied to the operculum, i.e., the claw or nail of the strombus or wing-shell, a univalve common in the Red Sea. The opercula of these shell-fish when burned emit a strong odour "like castoreum." This was an ingredient in the sacred incense.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Onycha'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/o/onycha.html. 1897.