Etymology
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etui (n.)

1610s, also ettuy, etwee from French étui, Old French estui (12c.) "case, box, container," back-formation from estuier "put in put aside, spare; to keep, shut up, imprison," which is of uncertain origin. Perhaps from Latin studere "to be diligent."

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Definitions of etui

etui (n.)
small ornamental ladies' bag for small articles;
From wordnet.princeton.edu