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| a compound in which oxygen is bonded to one or more electropositive atoms |
| with all water removed, especially water of crystallization |
| columbium (kəˈlʌmbɪəm) | |
| —n | |
| the former name of niobium | |
| [C19: from New Latin, from Columbia, the United States of America] | |
columbium
chemical element, refractory metal of Group Vb of the periodic table, used in alloys, tools and dies, and superconductive magnets. Niobium is closely associated with tantalum in ores and in properties.
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