half tone

{ or }, n. 1. (Fine Arts) An intermediate or middle tone in a painting, engraving, photograph, etc.; a middle tint, neither very dark nor very light. [ Webster 1913 Suppl. ]

2. (Music) A half step. [ Webster 1913 Suppl. ]

3. A print obtained by the half-tone photo-engraving process. [ wns=1 ] [ PJC ]

4. the etched plate used to reproduce a half-tone illustration. [ wns=4 ]
Syn. -- halftone engraving, photoengraving. [ WordNet 1.5 ]