noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The process of metamorphism at extreme temperatures and pressures where rocks are partially heated to magma, to which the affected rocks then become metamorphic after fusing. uncountable

Etymology

From ultra- + metamorphism.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.