Enter a clue or pattern or both:
The Clue
Aeronautical pioneer (7 letter answer)
The Answer
LANGLEY
Tags
Notes
The answer LANGLEY is so rare that it appears less than once every 2500 puzzles.
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NASA research center
Definition
LANGLEY as a noun:
1. unit of solar radiation
2. (Langley, Samuel Pierpoint Langley) = United States astronomer and aviation pioneer who invented the bolometer and contributed to the design of early aircraft (1834-1906)