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cast iron a mixture of iron and carbon, with other materials added to make it either hard and brittle or soft and strong.
castle a large, strong building where a noble lived with his family and servants. Many castles were built long ago to defend the people inside against attacks. [2 definitions]
casual happening by chance; not planned. [3 definitions]
casualty a person in the armed forces who is killed, wounded, or missing in action. [2 definitions]
cat1 a small, furry mammal with whiskers, short ears, and a long tail. Cats, also called house cats, are often kept as pets or to catch mice and rats. [2 definitions]
catalog an organized list of things such as book titles, goods for sale, or other items. Catalogs usually give a short description of each item on the list. [2 definitions]
catamaran a boat with two hulls joined side by side.
catapult an ancient weapon used to throw objects, such as large stones or arrows, at an enemy. [4 definitions]
cataract a large waterfall. [2 definitions]
catastrophe an event that brings great harm, suffering, or loss to a large area or many people; terrible disaster.
catbird a dark gray North American songbird. One of its calls is like the sound a cat makes.
catch to get control of (someone or something moving away); capture. [13 definitions]
catcher the player who is behind the batter at home plate in baseball or softball. The catcher catches balls thrown by the pitcher.
catch fire to start to burn.
catching likely to infect or be passed on to another.
catch someone's eye to get the attention of.
catchup another spelling of ketchup.
catch up to reach or come up to from behind and next to (usually followed by "to" or "with"). [2 definitions]
category a particular section of a main group; class.
cater to supply food or other service. [3 definitions]
caterpillar the larva, or middle life stage, of a moth or butterfly. Caterpillars are round and long like worms, but have six legs. They may be brightly colored.