noun
General term for a three-dimensional round object; used in everyday and scientific contexts.
地球は完全な球体ではない。
The Earth is not a perfect sphere.
noun
ball; solid sphere
Mathematical term for a solid spherical shape, as opposed to just the surface (球面).
数学では、球体は球面とその内部を含む。
In mathematics, a ball includes the spherical surface and its interior.