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Definition of Hydrium
1. Noun. (obsolete chemistry) ''a metallic gas'' — a former name of hydrogen ''Fireside Science'', [ What is Water?], 1872 ¹
2. Noun. (rare chemistry) protium "Alkylation of Alkanes", by ''Gustav Egloff'' & ''George Hulla'', published by '''Reinhold Pub. Corp.''', '1948' ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Hydrium
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