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Environmental warning Crossword Clue

8 letters · New York Times · Sunday, September 19, 1999 · 79-Across

Appeared in 1 New York Times Crossword: Sunday, September 19, 1999.

Exact puzzle match · New York Times · September 19, 1999 · 79-Across · 8 letters

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What does this clue mean?

the warning signal that begins a period of preparation for an enemy air attack

noun

WordNet® (Princeton University)

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