codpiece

Middle English codpese, from cod “bag, scrotum” (going back to Old English codd, akin to Middle Dutch codde “cylindrical piece of wood,” Old Frisian kudda “cudgel,” Middle Low German kudde, kodde “hog,” Old Norse koddi “pillow, scrotum,” all from a Germanic base denoting something distended and unevenly shaped) + pese ¹piece