Retarc
//ˈɹiːtɑː(ɹ)k// noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 A rubble mound occasionally formed by a powerful underground explosion (usually nuclear) in solid rock, due to the chimney of shattered rock above the explosion occupying a greater volume than the solid rock previously present.
Etymology
From crater reversed, signifying the formation of an elevated mound rather than the typical sunken crater.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.