Dictionary  yt•ter•bi•umPronunciation: (i-tûr'bē-um), [key] —n. Chem. a rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb; at. wt.: 173.04; at. no.: 70; sp. gr.: 6.96. Cf. rare-earth element. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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