semiellipse

sem·i·el·lipse

[sem-ee-i-lips, sem-ahy-]
noun Geometry.
a half ellipse, usually one containing both ends of the major axis.

Origin:
1725–35; semi- + ellipse

sem·i·el·lip·tic [sem-ee-i-lip-tik, sem-ahy-] , sem·i·el·lip·ti·cal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Semiellipse is always a great word to know.
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