Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


n. Symbol Yb
A soft, bright, silvery element of the lanthanide series occurring in three allotropic forms and used as an x-ray source for portable irradiation devices, as a dopant for laser materials, and in solar cells and some special alloys. Atomic number 70; atomic weight 173.05; melting point 824°C; boiling point 1,196°C; specific gravity 6.903 (alpha form), 6.966 (beta form); valence 2, 3. See Periodic Table.

[After Ytterby, a town in Sweden.]

yt·ter′bic (-bĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


related to, derived from, or containing ytterbium
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014