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Meaning of scaleboard

scale•board

Pronunciation: (skāl'bôrd", -bōrd", skab'urd), [key]
— n.
  1. a very thin board, as for the back of a picture.
  2. a thin strip of wood used in justifying.
  3. a thin sheet of wood used as veneer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.