from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A smooth, hard, dark-colored panel for writing on with chalk.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A large flat surface, finished with black slate or a similar material, that can be written upon with chalk and subsequently erased; a chalkboard
- v. To use a blackboard to assist in an informal discussion.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- n. A board painted black, used in schools, lecture-rooms, etc., for writing, drawing, or ciphering with chalk.
- n. Hence Any prepared surface, as of plaster or slate, used for the same purpose.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. sheet of slate; for writing with chalk
The monster crystals, over six meters long, are made of selenite, a crystalline form of the mineral gypsum (the number one ingredient in blackboard chalk!).
I dont draw in blackboard chalks like these others, I use proper colours the same as what painters use; bloody expensive they are, especially the reds.
Each blackboard is provided with a small case in which are kept the chalk, and the white cloths which we use instead of the ordinary erasers.
It’s obvious that the key to the universe is hidden in this photo of Einstein’s blackboard from the day he died.
ACOUSTICS – D. Lynn Halpern, Randolph Blake and James Hillenbrand of Chicago’s Northwestern University for a 1986 experiment aimed at discovering why the sound of fingernails scraping on a blackboard is so irritating.
The two dozen participants started off by identifying “what’s wrong with the media,” and the blackboard is filled with complaints ranging from the lack of in-depth analysis and foreign news coverage to story repetition and reinforcement of stereotypes.
Behind him is a blackboard, which is later flipped around on its horizontal axis to reveal further scenes.
At the top of the blackboard was the estimated number of bulb sockets in the world: that was the market estimate for the product.
Coaches who can outline plays on a blackboard are a dime a dozen.
This time, there was pure cacophony, as some students repeated what he said, some said the same sentence with ‘you’ and others decided to call the blackboard a whiteboard, as this is what the previous trainee had called it.