blackboard
Word family verbblackenblackballnounblackingblacknessblackamoorblack artblackballingblackbandblack beltblackberryblackberryingblackbirdblackbirderblackbirdingblackboardblack boxblackboyblackbuckblackcapblackcockblackcurrantblack economyblack eyeblackfaceblackfishBlackfootblackgameblack goldblackguardblackguardismblackheadblackheartblack holeblack iceblackjackblackleadblacklegblacklistblacklistingblack marketBlack Muslimblackoutblack pepperblackpollblack puddingblack sheepBlackshirtblacksmithblackthornblacktopblackwashblackwaterblack widowblackwoodadjectiveblackishblack and whiteblackfacedblackguardlyblackheadedblackadverbblackly
Education
black·board /ˈblækbɔːd $ -bɔːrd/ ●●● S3 noun [countableC] 
SEa board with a dark smooth surface, used in schools for writing on with chalk 黑板Examples from the Corpus
blackboard• And through another he saw a classroom with lots of tiny desks and a blackboard at one end.• The screen becomes an individualised blackboard for each child.• Nailed to the wall was a large blackboard with a compartment for chalk attached to it.• Mathematicians scribble equations on blackboards and program supercomputers to make the billions of calculations needed to break a tough code.• Compatibility between components was ensured by using a structurally uniform global database, the blackboard.• Periodically he will explain a rule or illustrate its use on the blackboard.• Table 9. 1 illustrates how your blackboard might look.