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fourth world (often cap.) the countries of the world that are poorest in resources and capital and have the most poorly educated population; least developed countries.
four-way giving access or passage in four directions. [2 definitions]
four-wheel drive a car that drives by means of all four wheels rather than the rear wheels only, or the drive system of such, in which both front and rear wheel axles are turned by the drive shaft.
fovea a small pit, hollow, or depression in a bone or organ.
fovea centralis a small depression at the back of the retina, forming the most acute point of vision.
foveola a small fovea, or very small depression or pit in a bone or organ.
fowl any of various domestic birds cultivated for their eggs or meat, such as chickens or turkeys. [4 definitions]
fox a wild carnivore, related to dogs and wolves, that has a pointed muzzle, erect ears, and a bushy tail. [7 definitions]
foxed stained or discolored with yellowish brown spots from dampness or age, as book pages or prints.
foxfire a phosphorescent glow from organic matter, esp. from certain fungi that grow on rotting wood. [2 definitions]
foxglove any of several plants related to the snapdragon that bear tubular purple, white, or pinkish flowers drooping from upright stalks and have leaves that provide digitalis for medicinal use.
fox grape a wild vine of the eastern United States, having leaves whose undersides are covered with wooly hairs and bearing purplish black grapes.
foxhole a shallow pit dug to provide a quick, temporary shelter from enemy fire for one or two soldiers.
foxhound any one of several breeds of medium-sized short-haired hounds often trained to hunt foxes.
fox hunt a sport in which hunters on horseback follow dogs in pursuit of a fox. [2 definitions]
fox snake a harmless rat snake, having a yellowish color with dark patches on the back.
fox squirrel any of several large tree squirrels, varying in color, that are found in the eastern part of the United States.
foxtail the tail of a fox. [2 definitions]
fox terrier one of two breeds of English terriers with long lean heads, formerly trained to drive foxes from their holes.
fox trot a ballroom dance in four-four time, consisting of a variety of short and long steps. [2 definitions]
fox-trot to dance a fox trot.