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blackboard a smooth, hard panel for writing on with chalk; chalkboard. Blackboards are often made of slate and have a dark color.
blackboard eraser an object made of layers of felt used for erasing chalk from a blackboard.
blacken to make black; make dark. [3 definitions]
black eye bruised skin around the eye, often caused by being hit.
black hole a region or body in space with gravity so strong that neither light nor matter can escape it. Scientists believe that black holes form when very large stars collapse.
blackmail money demanded from someone by another person who threatens to give out information that would harm that person. [3 definitions]
blackout the loss or hiding of all the lights of a city or region. Cities may have blackouts because of power failures. [2 definitions]
black out to faint or pass out.
Black Sea a sea that lies between Europe and Asia. It is surrounded by Russia, Ukraine, Georgia, Turkey, Bulgaria, and Romania.
blacksmith a person who forges and shapes iron. Blacksmiths soften the iron with heat and use hammers and anvils to form it into various items.
blacktop a substance such as asphalt, used as pavement. [2 definitions]
black widow a small spider of North and South America. The female has a shiny, black body with a red mark on her underside and a poisonous bite.
bladder an organ inside the body that collects urine. The bladder gets larger when it fills and smaller when it becomes empty.
blade the cutting part of a knife, sword, scissors, or saw. [4 definitions]
blame to place responsibility on for a mistake or fault. [3 definitions]
blank without marks or writing. [6 definitions]
blanket a thick piece of material used on a bed for warmth or worn as clothing. [3 definitions]
blare to sound loudly and harshly. [2 definitions]
blast a powerful and sudden gust or stream. [6 definitions]
blastoff the launching of a spacecraft or missile.
blaze1 a bright flame or light. [4 definitions]