Counter-earth
noun ·Rare ·Advanced level
Definitions
- 1 A hypothetical planet sharing an orbit with the earth, but on the opposite side of the sun. no-plural
"To the same period may perhaps belong the theory that the comet is a separate planet; this eighth planet might serve, when the counter-earth had been discarded, to maintain the number ten in regard to the heavenly bodies."
- 2 Alternative form of counter-earth. alt-of, alternative
"Possibly to explain eclipses, and possibly to achieve for the astral world the perfection of the number Ten, Philolaus imagined that a dark Counter-Earth existed, invisible to the Earth."
Synonyms
All synonymsExample
More examples"To the same period may perhaps belong the theory that the comet is a separate planet; this eighth planet might serve, when the counter-earth had been discarded, to maintain the number ten in regard to the heavenly bodies."
Etymology
From counter- + earth.
From counter- + Earth.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.