semicircle

[sem-i-sur-kuhl]
noun
1.
Also called semicircumference [sem-ee-ser-kuhm-fer-uhns, -fruhns, sem-ahy-] . half of a circle; the arc from one end of a diameter to the other.
2.
anything having or arranged in the form of a half of a circle.

Origin:
1520–30; < Latin sēmicirculus. See semi-, circle

semicircular [sem-i-sur-kyuh-ler] , adjective
semicircularly, adverb
semicircularness, noun
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World English Dictionary
semicircle (ˈsɛmɪˌsɜːkəl)
 
n
1.  a.  one half of a circle
 b.  half the circumference of a circle
2.  anything having the shape or form of half a circle
 
semicircular
 
adj
 
semi'circularly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

semicircle
1520s, from semi- + circle. Semicircular is attested from early 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
According to the recommendation, the charge circle would be placed in a
  semicircle three feet from the center of the basket.
The houses were arranged in a semicircle or circle around a central plaza.
At one end of the home-ec building, an exterior wall has been refurbished for
  interior use and now anchors the semicircle.
On the left of the picture you see the two big semicircle roads, the parking
  lot must have been there for the big stadium.
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