corium
Definitions
The deep layer of the skin, located beneath the epidermis; the dermis.
The innermost layer of the wall of a blood vessel.
The molten mass of fuel and structural materials formed during a nuclear reactor core meltdown.
Examples
The intense heat of the reactor core caused the fuel to melt into a substance known as corium.
Engineers worked to contain the corium before it could breach the secondary containment structure.