crossword solver & word finder

WHAT'S THIS WORD is a crossword solver & word finder. Just enter the word you are trying to solve in the box below, using question marks in place of the letter(s) that you don't know.

e.g. ?odge?odgeclose

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It's probably:

(n.) 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.