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forty the number represented by the Arabic numeral 40 and by the Roman numeral XL. [5 definitions]
forty-five a forty-five caliber pistol or revolver, or a cartridge of .45 inches in diameter to be used in such a gun. [3 definitions]
forty-niner one who joined the California gold rush in 1849.
forty winks (informal) a brief nap.
forum the central place in ancient Roman cities for the conduct of public and business affairs and for public assembly. [4 definitions]
forward at or toward a place or time beyond; further on; ahead. [13 definitions]
forwardness lack of modesty or humility in dealing with others; presumptuousness. [3 definitions]
forward pass a football pass made from behind the line of scrimmage to a player who is closer to the other team's goal.
forwent past tense of forgo.
fossa in anatomy, a pit, cavity, or depression.
fosse a ditch, esp. one used as a fortification.
fossil the remains or trace of a living organism from an earlier geologic age, embedded in earth or rock. [3 definitions]
fossil fuel any carbon-containing fuel formed from the remains of prehistoric plants and animals, such as coal, petroleum, and natural gas.
fossiliferous composed of or containing fossils.
fossilize to make into a fossil by replacing organic matter with mineral substances. [3 definitions]
foster to encourage and aid the growth or development of. [4 definitions]
foster home a home in which a child is cared for by someone other than his or her natural or adoptive parents.
fosterling a child to whom parental care is given by someone not related to him or her by law or heredity; foster child.
fouetté (French) in ballet, a move in which the dancer stands on point on one leg and kicks the other leg outward and back to the body, thereby spinning the entire body around.
fought past tense and past participle of fight.
foul extremely offensive to the senses, esp. of smell and taste, or permeated by something, such as an odor, that is offensive to the senses. [21 definitions]