| Answer | Crossword Clue |
|---|---|
| CORAL | Reef building material. |
| BRAINCORAL | Reef-building creature |
| 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 |
| CORAL | Reef material |
| CORAL | Barrier-reef material |
| CORAL | Ocean-reef material |
| CORAL | Marine-reef material |
| CORAL | Great Barrier Reef material |
| bioherm | a mound of material laid down by sedentary marine organisms, esp a coral reef |
