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French word sein comes from Arabic جَيْب
جَيْب (Arabic)
sinus (Latin)
A large bowl (Medieval, mathematics) chord of an arc, sine. A hollow, cavity. Bosom. Curve, fold, winding. Fold of the toga over the breast, pocket, lap. Gulf, bay. Heart, secret feelings.
sein (French)
(anatomy) breast. (literary) womb. Bosom.