Exthorio

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Synonym of thoron (“radon-220”). obsolete, uncountable

Synonyms

All synonyms
thoron

Etymology

From Latin ex (“out of”) + thōriō (“thorium”).

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