扁へん球きゅうへんきゅうMeanings1nounoblate spheroidTechnical term in geometry and astronomy for a sphere flattened at the poles, like the Earth.地ち球きゅうは完かん全ぜんな球きゅうではなく、扁へん球きゅうに近ちかい形かたちをしている。The Earth is not a perfect sphere; it is shaped more like an oblate spheroid.