Real Dictionary

aquatint in American English
a process by which spaces rather than lines are etched with acid, producing tones that give the effect of a wash drawing or watercolor
to etch in aquatint
to etch in this way
noun: a process imitating the broad flat tints of ink or wash drawings by etching a microscopic crackle on the copperplate intended for printing

aquatint in British English
noun: a technique of etching copper with acid to produce an effect resembling the flat tones of wash or watercolour. The tone or tint is obtained by acid (aqua) biting through the pores of a ground that only partially protects the copper
verb: to etch (a block, etc) in aquatint