Element used for shielding nuclear reactors Crossword Clue
5 letters · New York Times · Sunday, December 4, 2011 · 77-Down
Appeared in 1 New York Times Crossword: Sunday, December 4, 2011.
Exact puzzle match · New York Times · December 4, 2011 · 77-Down · 5 letters
BORON0 of 5 letters revealed
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What does this clue mean?
a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
noun
WordNet® (Princeton University)
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