Enter a clue or pattern or both:

The Clue

Submerged coral reefs (7 letter answer)

The Answer

BOILERS

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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