also: てんおうせい
noun
The seventh planet from the Sun. Used in astronomical contexts.
天王星は太陽系で三番目に大きい惑星です。
Uranus is the third largest planet in the solar system.
Standard kanji spelling for the planet Uranus.
Alternate reading; てんのうせい is far more common.
From 天王 (てんのう, 'heavenly king') + 星 (せい, 'star/planet'), a calque of the planet's name. The reading てんおうせい is a less common variant.