millhouse

[ mil-hous ]
/ ˈmɪlˌhaʊs /

noun, plural mill·hous·es [mil-hou-ziz] /ˈmɪlˌhaʊ zɪz/.

a building that houses milling machinery, especially of flour.

Origin of millhouse

1250–1300; Middle English milnehous; see mill1, house