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From: Webster's Revised Unabridged Dictionary (1913)

 Ek·a·bor Ek·a·bo·ron n.  Chem. The name given by Mendelejeff in accordance with the periodic law, and by prediction, to a hypothetical element then unknown, but since discovered and named scandium; -- so called because it was a missing analogue of the boron group. See Scandium.