polder mitton
/ˈpəʊldə mɪtn/ /ˈpɒldə mɪtn/(also polder mitten) Armour. Now historical
noun
A large curved piece of armour worn as reinforcement over the right arm at tournaments.
Origin
Mid 16th century; earliest use found in Inventory of Henry VIII. From Middle French espaule de mouton, transferred use of espaule de mouton shoulder of mutton (from espaule + de+ mouton), the piece of armour being so called on account of its shape.