Erbium
Pronunciation : Er"bi*um
Part of Speech : n.
Etymology : [NL. from Ytterby, in Sweden, where gadolinite is found. Cf. Terbium, Yttrium, Ytterbium.] (Chem.)
Definition : Defn: A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er. Atomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.
Source : Webster's Unabridged Dictionary, 1913