Lexical Definition

‎שְׁחֵלֶת‎ shᵉchêleth (shekh-ay'-leth) onycha ^H:N-F
apparently from the same as ‎שַׁחַל‎ through some obscure idea, perhaps that of peeling off by concussion of sound

onycha.

• a scale or shell, i.e. the aromatic mussel.

1) onycha
1a) an ingredient used in the holy incense

Brown-Driver-Briggs

‎שְׁחֵ֫לֶת‎ noun feminine an ingredient of the holy incense, + ‎נָטָף‎, ‎חֶלְבְּנָה‎, Exod 30:34 ᵐ5 ᵑ9 ὄνυξ, onyx (whence AV onycha), i.e. unguis odoratus, the operculum, or closing-flap, of certain molluscs, with pungent odour whenburnt, see Thes^{1388 f.} Di Shipley-Cook^{Ency. Bib. ONYCHA}; so most; KG Jacob^{ZMG xliii (1889), 354} proposes amber.

Brown-Driver-Briggs References