Iron: N. Hardware, Especially Older And Larger Hardware Of {mainframe} Class With Big Metal Cabinets Housing Relatively Low-density Electronics (but The Term Is Also Used Of Modern Supercomputers).

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:iron: n. Hardware, especially older and larger hardware of
{mainframe} class with big metal cabinets housing relatively
low-density electronics (but the term is also used of modern
supercomputers). Often in the phrase {big iron}. Oppose
{silicon}. See also {dinosaur}.
-- The AI Hackers Dictionary