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guinea pig a small, tailless rodent, often domesticated as a pet or used in scientific experiments. [2 definitions]
Guinea worm a long thin parasitic nematode worm of tropical Africa and Asia that lives under the skin of humans and other mammals.
Guinevere in Arthurian legend, the wife of King Arthur and secret lover of Lancelot.
Guinness Book of World Records a book published yearly since 1955 compiling thousands of world records including both human achievements and natural phenomena.
guise external appearance or semblance, esp. if deceptive. [2 definitions]
guitar a stringed musical instrument with a large soundbox, a long fretted neck, and five, six, or twelve strings that are strummed or plucked. [2 definitions]
guitarfish any of several sharklike ocean fish that are related to skates and rays and are shaped like a guitar.
gulag a Soviet forced labor camp, as for political prisoners. [2 definitions]
gulch a stony ravine with steep sides, esp. one having a seasonal stream running through it.
gulden the chief currency of Netherlands Antilles and, formerly, the chief currency of the Netherlands; guilder.
gules the color red in heraldic arms, indicated in an engraving by vertical lines.
gulf a large area of ocean partly surrounded by land. [4 definitions]
Gulf of Mexico an area of the Atlantic Ocean that is bounded by the southern coast of the United States, the eastern coast of Mexico, and the island of Cuba.
Gulf of Tonkin a shallow arm of the South China Sea lying between Vietnam and China, purportedly the site of North Vietnamese attacks on US ships that precipitated the United States' entry into the Vietnam War in 1964.
gulfweed any of a variety of brown seaweeds found in the Gulf Stream and Caribbean, bearing spherical air bladders.
gull1 any of a variety of web-toed aquatic birds characterized by long pointed wings, agile flight, and mostly gray and white plumage.
gull2 to trick; cheat. [2 definitions]
Gullah any of a group of former slaves and their descendants living on the Sea Islands of Georgia or in nearby coastal areas. [2 definitions]
gullet the throat or part of the throat, esp. the esophagus or pharynx. [3 definitions]
gullible readily believing and thus easily tricked or deceived.
gully a ravine or valley worn away by a watercourse or flooding and still serving as a drainage course for overflow. [3 definitions]