Dysprosium, element 66, was isolated in 1886 by French chemist Paul Émile Lecoq de Boisbaudran. Because of the difficulty he had in separating the element from the other substances in the sample, De Boisbaudran dubbed the new element after the Greek δυσπρόσιτος (dysprositos), meaning difficult to access.1

Dysprosium has the chemical symbol Dy.

1Oxford English Dictionary, dysprosium, 2nd Edition, 1989, Oxford University Press, accessed 21 October 2009, http://dictionary.oed.com/cgi/entry/50071430

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