Hypertext Webster Gateway: "semicircle"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Semicircle \Sem"i*cir`cle\, n.
1.
(a) The half of a circle; the part of a circle bounded by
its diameter and half of its circumference.
(b) A semicircumference.
2. A body in the form of half of a circle, or half of a
circumference.
3. An instrument for measuring angles.
From WordNet (r) 1.7 (wn)
semicircle
n : a plane figure with the shape of half a circle [syn: {hemicycle}]
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