retarc

noun

retarc

noun

/ˈɹiːtɑː(ɹ)k/

Etymology From crater reversed, signifying the formation of an elevated mound rather than the typical sunken crater.

Geography, Geology, Natural sciences 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.

Nuclear testing

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.