Ekaboron n. : 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.

Example:


Taxonomy
elements, predictions, atomic mass, Dmitri Mendeleev, the periodic table, density, gases, ether, Mendeleev's predicted elements, lighter, oxide, cm³, Ekaboron, scandium, free encyclopedia, atomic elements, Ekasilicon, gallium.

Defination from the web:
Ekaboron and scandium. 1.2 Ekaaluminium and gallium. 1.3 Ekamanganese and technetium. 1.4 Ekasilicon and germanium. 2 1871 predictions ... four predicted elements lighter than the rare earth elements, ekaboron (Eb), ekaaluminium (Ea), ekamanganese (Em), and ekasilicon (Es), proved to ...