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The Adobe Flash Player is required in order to view this content. You can get it here: ptosisOne entry found. Main Entry: pto·sis Pronunciation: \ˈtō-səs\ Function: noun Inflected Form(s): plural pto·ses \-ˌsēz\ Etymology: New Latin, from Greek ptōsis act of falling, from piptein Date: 1743 : a sagging or prolapse of an organ or part; especially : a drooping of the upper eyelid 
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