Meaning of SCRATCHBOARD in English

SCRATCHBOARD

noun Date: circa 1908 a black-surfaced cardboard having an undercoat of white clay on which an effect resembling engraving is achieved by scratching away portions of the surface to produce white lines

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.