Meaning of bead proof | Babel Free

Definitions

1. 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, and later by more accurate meters.
   dated, uncountable
2. 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.
   dated, uncountable

CEFR level