Thulium Definition
tho͝olē-əm
noun
A bright, soft, silvery rare-earth metal obtained commercially from monazite, having an x-ray emitting isotope that is used in small portable medical x-ray units. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,950°C; specific gravity 9.321 (at 25°C); valence 2, 3.
American Heritage
A bright, silvery chemical element, one of the rare-earth elements: symbol, Tm; at. no. 69
Webster's New World
Synonyms:
- atomic number 69
- tm
Origin of Thulium
-
Thule (as a poetic way to say Scandinavia) + -ium
From Wiktionary
After Thule
From American Heritage Dictionary of the English Language, 5th Edition
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