Source : Webster's Revised Unabridged Dictionary (1913)

Verjuice \Ver"juice`\, n. [OE. vergeous, F. verjus, that is, the
   juice of green fruits; verd, vert, green + jus juice. See
   {Verdant}, and {Juice}.]
   1. The sour juice of crab apples, of green or unripe grapes,
      apples, etc.; also, an acid liquor made from such juice.

   2. Tartness; sourness, as of disposition.