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There are 4 words ending with RONIUM

CORONIUM	• coronium n. (Historical) A supposed chemical element, hypothesized in the 19th century in order to explain a green… • CORONIUM n. the name given to a hypothetical element in the sun's corona showing spectral lines now known to be due to iron and nickel that have lost large numbers of electrons.
ERYTHRONIUM	• erythronium n. A plant of the genus Erythronium; a dogtooth violet. • erythronium n. (Obsolete) An early proposed name for vanadium. • Erythronium prop.n. A taxonomic genus within the family Liliaceae – the fawnlilies.
HYDRONIUM	• hydronium n. (Inorganic chemistry) The hydrated hydrogen ion, H₃O⁺. • HYDRONIUM n. the hydrated hydrogen ion, H3O+.
POSITRONIUM	• positronium n. (Physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (anti-electron)… • POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 35 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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