1. semicircle - Noun
2. semicircle - Verb
The half of a circle; the part of a circle bounded by its diameter and half of its circumference.
A semicircumference.
A body in the form of half of a circle, or half of a circumference.
An instrument for measuring angles.
Source: Webster's dictionary1 There is no name, either geographical or political, which includes all of this great semicircle (see map, p. 100). Source: Internet
At the start of the game, the cue ball (white) may be placed anywhere in the semicircle, known as the "D". Source: Internet
Depending on the ball carrier's location, the goalie is positioned along that semicircle roughly a meter out of the goal to reduce the attacker's shooting angle. Source: Internet
Note in particular: *de Rhodes' system has two different b letters, a regular b and a "hooked" b in which the upper section of the curved part of the b extends leftward past the vertical bar and curls down again in a semicircle. Source: Internet
He then estimated his distance from Whitefield and calculated the area of a semicircle centred on Whitefield. Source: Internet
In contrast both ancient Greek and ancient Roman theatres were built in a semicircle, with tiered seating rising on one side of the performance area. Source: Internet