A hypothetical or historical chemical element name proposed for an element (this appears to be an obsolete or rare designation).
From Latin root elements, likely combining 'deci-' (ten) with chemical naming conventions. This would be a rare or rejected name from early chemistry when element nomenclature was not yet standardized.
Chemistry used to be wild—scientists would propose element names that never stuck, like 'decipium.' Only about 118 elements actually made it into the periodic table, but hundreds of names were proposed and forgotten!
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