The Collaborative International Dictionary
Blackboard \Black"board`\ (bl[a^]k"b[=o]rd`), n. A broad board painted black, or any black surface on which writing, drawing, or the working of mathematical problems can be done with chalk or crayons. It is much used in schools. In late 20th century similar boards of a green slate as well as some colored white became common; wrioting on the slate bioards may be done with chalk, but writing on the white boards is done with colored pens, such as grease pens, which leaves a trace that can be easily erased. The newer boards, usualy called chalkboards are nevertheless still sometimes referred to as blackboards.
Wiktionary
n. (plural of chalkboard English)
Usage examples of "chalkboards".
The others followed him, through the hallway narrowed by bookshelves and chalkboards, to his own room where a light still burned.
Green chalkboards must have been on sale somewhere at a discount, for there appeared to be a dozen of them scattered about the house.
As he lectured, he gestured with a stub of chalk at complex biochemical formulae and nucleotide sequences scattered across the huge sliding chalkboards, indecipherable as cuneiform.
There was also a good supply of pubs, most of which had chalkboards near the doors to advertise their food.
How many times, how many, many times had he chalked for his father, at the chalkboards of the dartboards of the pubs of London, where he was raised.
General Komulakov looked up at the new, flat-screen plasma display boards, Quite a step up from the chalkboards they had when I got here.