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[tur-bee-uh m] /ˈtɜr bi əm/
noun, Chemistry.
a rare-earth, metallic element present in certain minerals and yielding colorless salts. Symbol: Tb; atomic number: 65; atomic weight: 158.924; specific gravity: 8.25.
Origin of terbium
1835-45; (Yt)terb(y), name of Swedish town where found + -ium. See ytterbium
Related forms
terbic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for terbium


a soft malleable silvery-grey element of the lanthanide series of metals, occurring in gadolinite and monazite and used in lasers and for doping solid-state devices. Symbol: Tb; atomic no: 65; atomic wt: 158.92534; valency: 3 or 4; relative density: 8.230; melting pt: 1356°C; boiling pt: 3230°C
Derived Forms
terbic, adjective
Word Origin
C19: from New Latin, named after Ytterby, Sweden, village where it was discovered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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terbium in Medicine

terbium ter·bi·um (tûr'bē-əm)
Symbol Tb
A soft metallic rare-earth element used in x-ray tubes. Atomic number 65; atomic weight 158.925; melting point 1,359°C; boiling point 3,221°C; specific gravity 8.23; valence 3, 4.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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terbium in Science
Symbol Tb
A soft, silvery-gray metallic element of the lanthanide series. It is used in color television tubes, x-ray machines, and lasers. Atomic number 65; atomic weight 158.925; melting point 1,356°C; boiling point 3,123°C; specific gravity 8.229; valence 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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