Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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.
  • noun 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.
  • noun Any body or arrangement of objects in the form of a half-circle.
  • noun An instrument for measuring angles; a species of theodolite with only half a graduated circle; a graphometer.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun a plane figure with the shape of half a circle

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

semi- +‎ circle

Examples

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