Enter a clue or pattern or both:
The Clue
Submerged coral reefs (7 letter answer)
The Answer
BOILERS
Tags
Notes
The answer BOILERS is so rare that it appears less than once every 2500 puzzles.
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Definition
BOILER as a noun:
1. (boiler, steam boiler) = sealed vessel where water is converted to steam
2. (kettle, boiler) = a metal pot for stewing or boiling; usually has a lid