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Children's Dictionary
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forty the word for the Arabic numeral 40 and the Roman numeral XL. [3 definitions]
forum the central place in ancient Roman cities where people gathered for business and public meetings. [2 definitions]
forward toward a place or time that is further on; ahead. [7 definitions]
fossil the remains or trace of a living animal or plant from a long time ago. Fossils are found embedded in earth or rock.
fossil fuel any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuels.
foster to aid and encourage the growth or development of. [2 definitions]
fought past tense and past participle of "fight."
foul very unpleasant to taste, smell, or look at. [11 definitions]
foul line either of the lines on a baseball field drawn from home plate through first and third bases to the outfield. Foul lines mark the area within which fair play takes place. [2 definitions]
foul up (informal) to make serious mistakes, or cause someone else to do so.
found1 past tense and past participle of "find."
found2 to set up or create; establish.
foundation the basis of something such as an action, substance, structure, or opinion. [4 definitions]
founder1 a person who establishes something new and important, such as an institution, religion, or nation.
foundry a place where metal is formed into different objects.
fountain a spray of water created by a machine, or the structure from which the water flows. [2 definitions]
fountain pen a pen that holds a small supply of ink, which is drawn to the pen's point.
four the word for the Arabic numeral 4 and the Roman numeral IV. [3 definitions]
Four-H club an organization in the U.S. that teaches young people about farming and how to take care of a home. Four-H clubs are so named because they are meant to improve the heads, hearts, hands, and health of their members.
foursquare having four equal sides that meet in four right angles; square. [4 definitions]
fourteen the word for the Arabic numeral 14 and for the Roman numeral XIV. [3 definitions]