Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Antarctic Circle an imaginary line drawn around the earth parallel to the equator and north of the South Pole.
Arctic Circle an imaginary line drawn around the earth parallel to the equator which marks the boundary of the Arctic. North of this line there are periods of continuous night in the winter and continuous day in the summer.
crop circle an area in a field of crops where plants have been systematically flattened into a circle or other geometric pattern, esp. when such flattening occurs mysteriously.
dress circle the first tier of seats above the ground floor in an opera house, theater, or the like.
equinoctial circle see celestial equator.
great circle a circle on a sphere that is in a plane passing through the center of the sphere. [2 definitions]
inner circle a small, exclusive group of influential people.
polar circle either the Arctic Circle or the Antarctic Circle.
quality circle any small group of workers in a factory or the like that meets regularly to discuss production improvements.
sewing circle a group of women who meet regularly to sew, often for a charitable cause such as a church sale.
traffic circle a circular roadway or street, in which traffic moves in one direction only, that is situated at a busy intersection to facilitate traffic flow.
vertical circle an imaginary circle on the celestial sphere that passes through the zenith and nadir and is thus perpendicular to the horizon.
vicious circle a situation in which the solution to a problem gives rise to another, which can be worse or may bring back the first with greater complications, thereby increasing the difficulty of solving any of them. [2 definitions]
winner's circle a small, usu. circular area at a racetrack where the winning horse, its jockey, and its owner receive recognition and awards.