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ground glass glass that diffuses light because its surface has been ground or etched. [2 definitions]
groundhog see "woodchuck."
Groundhog Day February 2, on which tradition asserts that a certain groundhog comes out of its hole, and that if it sees its shadow, six more weeks of winter weather will follow.
groundless not having a logical foundation; unsubstantiated.
groundling an animal or plant that moves or lives close to the ground. [2 definitions]
ground loop a sharp, unexpected, and often uncontrolled turn of an aircraft moving on the ground, as during landing.
groundnut any of several plants having edible underground nuts or tubers, such as the peanut.
ground plan a floor plan of a building. [2 definitions]
ground rule (usu. pl.) basic rules governing the behavior in a given situation, esp. as concerns the playing of a game on a particular field, course, or court.
grounds tiny pieces of solid matter, such as coffee, that settle at the bottom of a liquid. [2 definitions]
groundsel any of various weeds that bear small yellow flowers.
groundsill the lowest horizontal timber in the framework of a building.
groundskeeper a person responsible for the maintenance of the grounds of an estate, park, sports field, or the like.
ground squirrel any of various burrowing rodents, such as chipmunks, that differ from true squirrels in having cheek pouches and shorter fur.
groundswell a wide, slow-moving ocean swell, caused by a distant earthquake or storm. [2 definitions]
ground troops soldiers sent to carry out combat or security duties on land, carrying personal weapons.
ground water the water beneath the earth's surface that supplies springs and wells.
ground wave a radio wave traveling on or near the earth's surface and affected by its curvature, atmosphere, and the like.
ground wire a wire acting as a conductor of an electric current to the ground.
groundwork the preparations or basis for an undertaking.
ground zero the land or water surface directly above or below the point at which a nuclear bomb explodes.