noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A supposed chemical element, hypothesized in the 19th century in order to explain a green emission line seen during the total solar eclipse of 7 August 1869 (actually highly ionized iron). historical, uncountable

Synonyms

All synonyms

geocoroniumnebulium

Etymology

From corona + -ium, coined by a certain A. Gruenwald.

Related phrases

chemical elementsolar eclipse

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