a closed figure formed by arcs of great circles on a spherical surface.
Origin of spherical polygon
First recorded in 1715–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a closed geometric figure formed on the surface of a sphere that is bounded by three or more arcs of great circles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012