noun Download 🔗Share A surface, all of whose cross sections are elliptic or circular (including the sphere), that generalises the ellipse and in Cartesian coordinates (x, y, z) is a quadric with equation x2/a2 + y2/b2 + z2/c2 = 0. Examples : "The planetarium showed models of various ellipsoids, demonstrating how planets and other celestial bodies are not perfect spheres. " math physics space Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share Such a surface used as a model of the shape of the earth. Examples : "Here the geoid is thirty meters below the ellipsoid." geography world geology math Chat with AIVocabulary GamePractice Reading