球きゅう冠かんMeanings1nounspherical cap; spherical domemathematicsA mathematical term for the portion of a sphere cut off by a plane. Used in geometry and related fields.球きゅう冠かんの体たい積せきを求もとめる公こう式しきを覚おぼえていますか。Do you remember the formula for the volume of a spherical cap?