tertiary planet

English

Etymology

tertiary +‎ planet.

Noun

tertiary planet (plural tertiary planets)

1. Used other than figuratively or idiomatically: see tertiary,‎ planet. (the third planet; usually counting outwards from the central sun)
2. (archaic, astronomy) A planet of the third-degree/third-order. The planet of a planet (secondary planet) of a planet (primary planet). An object (moonmoon) which orbits an object (moon) which orbits an object (planet) which orbits a star.
3. (astrology) An aspect in astrology, a calculated node in a reading, that is not a real planet.