tertiary planet

noun

Used other than figuratively or idiomatically: see tertiary, planet. (the third planet; usually counting outwards from the central sun)

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Meanings

nountertiary planet (plural tertiary planets)

plural tertiary planets

  1. Used other than figuratively or idiomatically: see tertiary, planet. (the third planet; usually counting outwards from the central sun)
  2. archaicastronomyA 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. astrologyAn aspect in astrology, a calculated node in a reading, that is not a real planet.

Synonyms & antonyms

Also see
subsatellite

Origin

From tertiary + planet.

Full word history & related roots →
Cite this entry
APA

tertiary planet. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/tertiary%20planet

MLA

“tertiary planet.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/tertiary%20planet. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “tertiary planet,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/tertiary%20planet.

Source: tertiary planet on Wiktionary, CC BY-SA 4.0.