An obsolete name for the element beryllium, used in early chemistry before the modern IUPAC naming system standardized element names.
From Greek 'glukus' (sweet) plus the Latin suffix '-ium' used for element names; coined when beryllium compounds were noted for their sweet taste.
Glucinium is chemistry's way of remembering when scientists named things based on taste tests—beryllium really does taste sweet, but we stopped naming elements that way because, well, toxicity!
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