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erbium (n.)

1843, coined in Modern Latin with metallic element name -ium + erbia, name given by Swedish chemist Carl Gustaf Mosander (1797-1858), who discovered it, from second element in Ytterby, name of a town in Sweden where mineral containing it was found (see Ytterbium).

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Definitions of erbium from WordNet

erbium (n.)
a trivalent metallic element of the rare earth group; occurs with yttrium;
Synonyms: Er / atomic number "
From wordnet.princeton.edu