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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A half of a circle as divided by a diameter.
  • n. An object or arrangement of objects or people in the shape of half a circle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Half of a circle.
  • n. An instrument for measuring angles.

from the GNU version of the Collaborative International Dictionary of English

  • n.
  • n. The half of a circle; the part of a circle bounded by its diameter and half of its circumference.
  • n. A semicircumference.
  • n. A body in the form of half of a circle, or half of a circumference.
  • n. An instrument for measuring angles.

from The Century Dictionary and Cyclopedia

  • n. The half of a circle; the part of a circle comprehended between a diameter and the half of a circumference; also, the half of the circumference itself.
  • n. Any body or arrangement of objects in the form of a half-circle.
  • n. An instrument for measuring angles; a species of theodolite with only half a graduated circle; a graphometer.
  • n. In meteorology, one half of the area covered by a cyclonic storm. In the northern hemisphere the dangerous semicircle for navigation is that on the right-hand side as one advances along the path of the center of a progressive storm: the manageable, or navigable, or safer semicircle is that on the left-hand side.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a plane figure with the shape of half a circle


semi- +‎ circle (Wiktionary)



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