楕だ円えん軌き道どう

noun

elliptical orbit

Technical term in astronomy for an orbit shaped like an ellipse, as opposed to a perfect circle.

• 惑わく星せいは太たい陽ようの周まわりを楕だ円えん軌き道どうで回まわっている。

  Planets revolve around the sun in elliptical orbits.