half ‧ tone /ˌhɑːfˈtəʊn◂ $ ˈhæftoʊn/ BrE AmE noun
1 . [uncountable] a method of printing black and white photographs that shows different shades of grey by changing the number of black ↑ dot s in an area of the photograph
2 . [countable] a photograph printed by this method