Real Dictionary

rolling mill
countable noun: A rolling mill is a machine or factory in which metal is rolled into sheets or bars.

rolling mill in American English
a factory in which metal bars, sheets, etc. are rolled out
noun: a mill where ingots, slabs, sheets, etc., of usually hot metal are passed between rolls to give them a certain thickness or cross-sectional form

rolling mill in British English
noun: a mill or factory where ingots of heated metal are passed between rollers to produce sheets or bars of a required cross section and form