The Collaborative International Dictionary
Ekaluminium
Ekaluminium \Ek*al`u*min"i*um\, n. [Skr. [=e]ka one + E. aluminium.] (Chem.) The name given to a hypothetical element, -- later discovered and called gallium. See Gallium, and cf. Ekabor.
Wiktionary
ekaluminium
n. (context chemistry archaic English) gallium, as a hypothetical element before its discovery