semi-circle

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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