Source : Webster's Revised Unabridged Dictionary (1913)

Aquatint \A"qua*tint\, Aquatinta \A`qua*tin"ta\, n. [It.
   acquatinta dyed water; acqua (L. aqua) water + tinto, fem.
   tinta, dyed. See {Tint}.]
   A kind of etching in which spaces are bitten by the use of
   aqua fortis, by which an effect is produced resembling a
   drawing in water colors or India ink; also, the engraving
   produced by this method.

Source : WordNet®

aquatint
     n 1: an etching made by a process that makes it resemble a water
          color
     2: a method of etching that imitates the broad washes of a
        water color
     v : etch in aquatint