D defs.my
Entry 2 senses Webster, 1913

Bead proof

/bēd pro͞of/ · Bead· proof · IPA
01 Among distillers, a certain degree of strength in alcoholic liquor, as formerly ascertained by the floating or sinking of glass globules of…
  1. 1.
    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.
  2. 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.