Definitions
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
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fbharjo commented on the word atomic number 69
thulium
March 3, 2012