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n.1.(Chem.) The name of a hypothetical element predicted and afterwards discovered and named germanium; - so called because it was a missing analogue of the silicon group. See Germanium, and cf. Ekabor.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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It turned out to be ekasilicon and filled the one remaining gap for which Mendeleyev had predicted a new element (see 1869).