The meaning of Onycha in the Bible
(From 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.

See more on the meaning of Onycha in the Bible:
Onycha {International Standard Bible Encyclopedia}

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