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erbium er·bi·um (ûr'bē-əm)
A soft rare-earth element, used in metallurgy and nuclear research. Atomic number 68; atomic weight 167.26; melting point 1,529°C; boiling point 2,860°C; specific gravity 9.066; valence 3.
A soft, silvery, metallic element of the lanthanide series. It is used as a neutron absorber in nuclear technology and in light amplification for fiber-optic telecommunications. Atomic number 68; atomic weight 167.26; melting point 1,497°C; boiling point 2,900°C; specific gravity 9.051; valence 3. See Periodic Table.
(Er), chemical element, rare-earth metal of the lanthanoid series of the periodic table. Erbium is a grayish silver element that also occurs as a series of pink compounds. It had limited commercial uses until the age of fibre-optic telecommunications, when it became an important constituent of the signal repeaters in long-distance telephone cables.