Protolith

//ˈpɹoʊ.təˌlɪθ// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The original precursor of any specified metamorphic rock

Synonyms

All synonyms
unmetamorphized

Etymology

From proto- + -lith.

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