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blackboard [ˈblækˌboɚd]

blackboard images #1 from : https://pbs.twimg.com/media/DyunhS3WoAE6KIP.jpg
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blackboard images #2 from : https://res.cloudinary.com/rebelwalls/image/upload/b_black,c_fill,fl_progressive,h_533,q_auto,w_800/v1428564742/article/R10851_image1
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1 blackboard noun
  • a smooth, dark surface that is used for writing on with chalk in a classroom —called also (chiefly US) chalkboard