Antiearth
adj, noun ·Rare ·Advanced level
Definitions
- 1 A hypothetical analog to earth composed entirely of antimatter.
"This principle states that, if we could somehow replace every particle on earth with its antiparticle—thus creating a sort of antiearth—no one would be able to tell the difference."
- 2 A hypothetical twin planet to earth, proposed by the Pythagoreans, which cannot be seen from earth. historical
"The old imaginary antiearth (άγτιχϑωγ) of the Pythagoreans does not belong to the sphere of these conjectures. It and the Earth were supposed to have a parallel concentric movement; it was an idea devised to spare the Earth, which was supposed to perform around the central fire a planetary revolution in 24 hours, from having also to execute a movement of rotation, and, indead, represented no doubt the opposite hemisphere, or the antipodal half of our planet."
- 1 Facing or moving away from earth. not-comparable
"If particles that originally occupy a box which is 20RE long in the earth-antiearth direction and 10Rf wide perpendicular to the neutral sheet leak out of a slit of 4Rf wide with a speed of 400 km/s, it takes 800s before all the particles are lost."
- 2 Opposed to or destructive of the earth and things native to the earth. not-comparable
"One thought that much of curricula currently taught, including math and science, could be construed as antiearth, and that students need to feel they are being affected personally in order to be mobilized to action."
Example
More examples"This principle states that, if we could somehow replace every particle on earth with its antiparticle—thus creating a sort of antiearth—no one would be able to tell the difference."
Etymology
From anti- + earth.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.