| Answer | Crossword Clue |
|---|---|
| ATOLL | Reef in a ring |
| ATOLL | Reef ring |
| ATOLL | Ring-shaped reef |
| ATOLL | Ring-shaped reef. |
| ATOLL | Ring-shaped coral reef |
| reefed | reduce a sail by taking in a reef |
| heave | to shake loose (a reef taken in a sail) |
| madrepore | a coral of the common reef-building type, occurring esp in tropical seas |
| madrepores | MADREPORE, a coral of the common reef-building type, occurring esp in tropical seas |
