(astronomy) a point where an orbit crosses a plane WordNet 3.0 & Open English WordNet

An orbital node is either of the two points where an orbit intersects a plane of reference to which it is inclined. Wikipedia

The points where an orbit crosses a plane of reference Wikipedia Disambiguation

Point where an orbit crosses a plane of reference to which it is inclined Wikidata

A point where an orbit crosses a plane. OmegaWiki

The point where the orbit of a planet, as viewed from the Sun, intersects the ecliptic. The ascending and descending nodes refer respectively to the points where the planet moves from South to North and N to S; their respective symbols are ☊ and ☋. Wiktionary

Astronomy: where the orbit of a planet intersects the ecliptic. Wiktionary (translation)