Dictionary
black•board
Pronunciation: (blak'bôrd", -bōrd"), [key]—
n.
a sheet of smooth, hard material, esp. dark slate, used in schools, lecture rooms, etc., for writing or drawing on with chalk. Also called
chalkboard. Cf.
greenboard.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.