† mill-washingn.
Origin: Formed within English, by compounding. Etymons: mill n.1, washing n.
Etymology: < mill n.1 + washing n. Compare mill-wash v.
Obsolete.
1756 F. Home 73 Mill-washing appears a more profitable method of taking out both salts and oils.
This is a new entry (OED Third Edition, March 2002; most recently modified version published online June 2018).