双そう曲きょく幾き何か学がくそうきょくきかがくじ字FuriganaMeanings1nounhyperbolic geometrymathematics›A branch of non-Euclidean geometry dealing with spaces of constant negative curvature. Technical term used in mathematics.双そう曲きょく幾き何か学がくでは、平へい行こう線せんが