Morrish Bible Dictionary
One of the ingredients of the holy 'perfume' which was burnt as incense. Exodus 30:34 . The Hebrew is shecheleth; onycha is from the Greek ὄνυξ, 'nail or claw,' and it is supposed to refer to the operculum or claw of one or more species of the Strombus , a shell fish: the claw gave a sweet odour when burnt.
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Morrish, George. Entry for 'Onycha '. Morrish Bible Dictionary. https://www.studylight.org/dictionaries/eng/mbd/o/onycha.html. 1897.