Definition of merchant mill in US English:

merchant mill

noun

  • 1US (originally Amer.). A mill engaged in the purchase and grinding of grain and its resale as flour, etc. Compare custom mill. Now historical.

  • 2Originally US. A rolling mill producing iron or steel, especially in special shapes and sizes designed to meet the requirements of a particular market.

Origin

Mid 18th century; earliest use found in New York Mercury. From merchant + mill.

Pronunciation

merchant mill

/ˈməːtʃ(ə)nt mɪl/