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blackboard (n.)

"board painted black and written on in chalk," especially as used in schoolrooms, 1823, from black + board (n.1). Blackboard jungle "inner-city school rife with juvenile delinquency" is from Evan Hunter's novel title (1954).

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Definitions of blackboard

blackboard (n.)
sheet of slate; for writing with chalk;
Synonyms: chalkboard
From wordnet.princeton.edu