1. a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime; [syn: ytterbium, Yb, atomic number 70]
WordNet (r) 3.0 (2006):
atomic number 70
n 1: a soft silvery metallic element; a rare earth of the
lanthanide series; it occurs in gadolinite and monazite and
xenotime [syn: ytterbium, Yb, atomic number 70]