LATIN DICTIONARYLexicon Latīnum
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“shell” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

shell s.
cortex (e.g., of nuts): crusta (a crust; hard, thick coat): corium (a leather-like covering e.g., of chestnuts): cutis (a thin covering, skin): putamen (of eggs, nuts, beans, testaceous animals): testa (of animals, and eggs): folliculus (of pulse and corn): tunica (husk of corn).
shell v.
Transitively, putamen alicui rei detrahere; desquamare (to take off the scales).
Intransitively, cutem, corticem, etc., deponere, exuere, desquamari (in scales). To shell teeth, dentes cadunt, excidunt.

Quick answer

What is the Latin word for shell?
The usual Latin words for “shell” are cortex, crusta, corium; also cutis, putāmen, testa. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.