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The Clue

One of the rare earths (9 letter answer)

The Answer

YTTERBIUM

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Notes

The answer YTTERBIUM is so rare that it appears less than once every 2500 puzzles.

Definition

YTTERBIUM as a noun:

1. (ytterbium, Yb, atomic number 70) = a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime