Bible Dictionaries
Bead Proof

Webster's Dictionary

(1):

A degree of strength in alcoholic liquor as shown by beads or small bubbles remaining on its surface, or at the side of the glass, when shaken.

(2):

Among distillers, a certain degree of strength in alcoholic liquor, as formerly ascertained by the floating or sinking of glass globules of different specific gravities thrown into it; now ascertained by more accurate meters.

Bibliography Information
Webster, Noah. Entry for 'Bead Proof'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​b/bead-proof.html. 1828.