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ytterbium    
n. 镱

镱

ytterbium
镱 YB

ytterbium
n 1: a soft silvery metallic element; a rare earth of the
lanthanide series; it occurs in gadolinite and monazite and
xenotime [synonym: {ytterbium}, {Yb}, {atomic number 70}]

Ytterbium \Yt*ter"bi*um\, n. [NL., fr. Ytterby, in Sweden. See
{Erbium}.] (Chem.)
A rare element of the boron group, sometimes associated with
yttrium or other related elements, as in euxenite and
gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf.
{Yttrium}.
[1913 Webster]

Note: Ytterbium is associated with other rare elements, and
probably has not been prepared in a pure state.
[1913 Webster]

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