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Meaning of scratchboard

scratch•board

Pronunciation: (skrach'bôrd", -bōrd"), [key]
— n.
  1. a cardboard coated with impermeable white clay and covered by a layer of ink that is scratched or scraped in patterns revealing the white surface below. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.