cuirasse

breastplate (piece of armour covering the chest and sometimes the back); armour (protective plates covering some lizards and fish); armour, armour plate (metal plating covering a ship for protection)

From Old French cuirace, probably borrowed from Old Occitan coirassa, or Italian corazza, or Old Aragonese cuyraça, from Late Latin coriacea (vestis) (“leather (garment)”), from coriaceus, ultimately from Latin corium, and probably influenced by cuir in French. Doublet of coriace.