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Upper region of space Crossword Clue

5 letters · New York Times · Wednesday, December 5, 2001 · 56-Down

Appeared in 1 New York Times Crossword: Wednesday, December 5, 2001.

Exact puzzle match · New York Times · December 5, 2001 · 56-Down · 5 letters

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What does this clue mean?

a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves

noun

WordNet® (Princeton University)

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