spherical triangle
The American Dictionary and Cyclopedia · 1910 · p. 1
A spherical polygon of three sides. It is a portion of the surface of a sphere bounded by the arcs of three great circles. The points where the arcs meet are called vertices of the triangle, and the arcs are called sides. spherical-trigonometry, 8. [TRIGONOMETRY.] spherical-ungula, s. A portion of the sphere bounded by a lune and two semicircles meeting in a diameter of the sphere.
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