coral
n. C / U B1 Intermediate US //ˈkɔɹəɫ// UK //kˈɒɹəl// coral
n. a hard substance that grows in the ocean and looks like colorful rocks or plants. It is made by tiny sea animals and often forms large reefs where fish live.
n. a hard, stony substance secreted by certain marine polyps as an external skeleton, typically forming extensive reefs in warm, shallow seas.
The divers saw bright orange coral on the sea floor.
Rising ocean temperatures are causing many coral reefs to lose their vibrant colors and die.
The Great Barrier Reef is composed of thousands of individual coral systems that provide a critical habitat for a vast array of marine biodiversity.
From coral.
Usage
Uncountable when referring to the substance or the color; countable when referring to specific biological species or colonies.