Definition of blackboard noun from the Oxford Advanced Learner's Dictionary

 

blackboard

 noun
noun
BrE BrE//ˈblækbɔːd//
 
; NAmE NAmE//ˈblækbɔːrd//
 
(also chalkboard especially in North American English) In school
 
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a large board with a smooth black or dark green surface that teachers write on with a piece of chalk to write on the blackboard compare whiteboard See related entries: In schoolExtra examples Please copy the homework from the blackboard. The homework is on the blackboard. You can’t just stand at the blackboard and talk.
See the Oxford Advanced American Dictionary entry: blackboard