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polar circle

DEFINITIONS OF: polar circle

1

n a line of latitude at the north or south poles

Examples:
Antarctic Circle
a line of latitude north of the south pole
Arctic Circle
a line of latitude near but to the south of the north pole; it marks the northernmost point at which the sun is visible on the northern winter solstice and the southernmost point at which the midnight sun can be seen on the northern summer solstice
Type of:
latitude, line of latitude, parallel, parallel of latitude
an imaginary line around the Earth parallel to the equator
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