noun

• (anatomy) The layer of skin between the epidermis and the subcutaneous tissues; the dermis.
• (anatomy) The deep layer of mucous membranes beneath the epithelium.
• (historical) Armour made of leather, particularly that used by the Romans.
  "Passing by the Corium Bubulum of the Classical Ancients, we see in an old charter, dated 1036, "Stallus Sutoris Vaccæ," i. e. the stall of a shoe-maker who used cow-skin."

noun

• (nuclear physics) A lavalike mixture of fissile material created in a nuclear reactor's core during a nuclear meltdown.
  "Mexico was given $100,000 to do a series of experiments in which small amounts (10 to 20 grams) of stainless steel and corium (a mixture of 55 percent iron, 10 percent zirconium, and 35 percent uranium dioxide) will be melted and then flooded with water in an arc-melting chamber."