[ur-bee-uh
m] 
| a rare-earth metallic element, having pink salts. Symbol: Er; atomic weight: 167.26; atomic number: 68. |
| er·bi·um (ûr'bē-əm) n. Symbol Er A soft, malleable, silvery rare-earth element, used in metallurgy and nuclear research and to color glass and porcelain. Atomic number 68; atomic weight 167.26; melting point 1,497°C; boiling point 2,900°C; specific gravity 9.051; valence 3. See Table at element. [After Ytterby, a town in Sweden.] |
erbium er·bi·um (ûr'bē-əm)
n.
Symbol Er
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.
| erbium (ûr'bē-əm) Pronunciation Key
Symbol Er 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. |
erbium
(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.
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