A crucible is a hard one Crossword Clue
4 letters · New York Times · Thursday, December 10, 2015 · 68-Across
Appeared in 1 New York Times Crossword: Thursday, December 10, 2015.
Exact puzzle match · New York Times · December 10, 2015 · 68-Across · 4 letters
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What does this clue mean?
a hard outer covering as of some amoebas and sea urchins
noun
WordNet® (Princeton University)
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