1. terbium

noun. A metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite.
Synonyms
atomic number 65 ytterbite metal gadolinite Tb monazite metallic element apatite
Antonyms
nonmetallic
Etymology
terbium (English)
Ytterby (Swedish)
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