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semiellipse

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

First recorded in 1725–35; semi- + ellipse
Related formssem·i·el·lip·tic [sem-ee-i-lip-tik, sem-ahy-] /ˌsɛm i ɪˈlɪp tɪk, ˌsɛm aɪ-/, sem·i·el·lip·ti·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018