(Heb. hemah), curdled milk (Genesis 18:8; Judges 5:25; 2Sam. 17:29), or butter in the form of the skim of hot milk or cream, called by the Arabs kaimak, a semi-fluid (Job 20:17; 29:6; Deuteronomy 32:14). The words of Proverbs 30:33 have been rendered by some "the pressure [not churning] of milk bringeth forth cheese."
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Butter'". "Easton's Bible Dictionary".