From Coastal Wiki
A massive, wave-resistant structure, built largely by coral, and consisting of skeletal and chemically precipitated material. Skeletal formation depends on the activity of symbiotic algae and zooxanthellae..
"Coral reefs/tropical oceans" is one of the habitat sub-categories within the section dealing with biodiversity of coastal and marine habitats and ecosystems.
- Allaby M. (1998). Dictionary of Ecology (2nd Ed). Oxford University Press: Oxford, (England). 440pp.