Answer: ULTRARED
ULTRARED is a crossword puzzle answer that we have spotted 3 times.
Referring Clues:
- Part of the invisible spectrum, old-style
- Invisible part of the spectrum, nontechnically
- Part of the invisible spectrum, informally
Last Seen In:
- Universal - May 29, 2008
- Washington Post - August 17, 2003
- New York Times - November 24, 2001
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