- noun a soft silvery metallic element, used in strengthening steel, in laser devices and in portable X-ray units
- A lustrous silver-white metal whose atomic number is 70. It is soft, malleable, and ductile, and exhibits allotropy. It has about 30 known isotopes, of which 7 are stable. Its applications include its use in lasers, semiconductors, and as an X-ray source. Its chemical symbol is Yb.
- chemical symbolYb