Source : Webster's Revised Unabridged Dictionary (1913)

Mezzotint \Mez"zo*tint\, n. [Cf. F. mezzo-tinto.]
   A manner of engraving on copper or steel by drawing upon a
   surface previously roughened, and then removing the roughness
   in places by scraping, burnishing, etc., so as to produce the
   requisite light and shade. Also, an engraving so produced.

Mezzotint \Mez"zo*tint\, v. t.
   To engrave in mezzotint.

Source : WordNet®

mezzotint
     n : print produced by an engraving that has been scraped to
         represent light or shade