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hafnium (n.)

rare element, 1923, Modern Latin, from Hafnia, Medieval Latin form of Danish Havn "harbor," the usual pre-1400 name of Copenhagen, Denmark, where the element was discovered by physicist Dirk Coster (1889-1950) and chemist George de Hevesy (1885-1966). With metallic element ending -ium.

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Definitions of hafnium from WordNet

hafnium (n.)
a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons;
Synonyms: Hf / atomic number "
From wordnet.princeton.edu