1. (noun) corals having calcareous skeletons aggregations of which form reefs and islands

• madriporian coral
• stony coral

1. (noun) corals having calcareous skeletons aggregations of which form reefs and islands

• brain coral
• mushroom coral
• stag's-horn coral
• staghorn coral

1. (noun) corals having calcareous skeletons aggregations of which form reefs and islands

• coral

1. (noun) corals having calcareous skeletons aggregations of which form reefs and islands

• madreporaria
• order madreporaria