Definition of "cinder block" []

• A usually hollow building block made with concrete and coal cinders. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Outfitted in serviceable beige tile and painted cinder block walls, the educational building was functional with no frills."
• "There was something so relaxing about being in the little cinder block room alone, with the heat blowing from the ceiling vents and the smell of Pine-Sol from the janitor’s cleaning the night before."
• "The first bullet broke a huge chunk out of the blue-sky wall and sent fragments of cinder block raining through the room."