Noun
(programming) A runtime environment where little to no abstraction is available: usually employing a low-level programming language, without access to any operating system facilities, and interfacing hardware directly.
Synonyms: bare hardware, bare machine
(computing) Physical hardware, as opposed to virtualised.
Synonym: bare hardware
Used other than figuratively or idiomatically: see bare, metal.
bare-metal stent
There was no death row at Cold Mountain, only E Block, set apart from the other four and about a quarter their size, brick instead of wood, with a horrible bare metal roof that glared in the summer sun like a delirious eyeball. Stephen King