Upper reaches of space Crossword Clue
5 letters · New York Times · Wednesday, February 24, 2016 · 57-Across
Appeared in 1 New York Times Crossword: Wednesday, February 24, 2016.
Exact puzzle match · New York Times · February 24, 2016 · 57-Across · 5 letters
ETHER0 of 5 letters revealed
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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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