coral

Coral isn't just a pretty pinkish-orange color—though it can mean that too. It also refers to tiny sea animals that live together in groups (colonies). Many of them make hard, stony homes that pile up over time and form coral reefs. People often call reefs the “rainforests of the sea” because so many fish and other creatures live there. Sadly, reefs can be badly harmed by warmer water and pollution, so protecting them matters. You might admire a coral necklace or see photos of the Great Barrier Reef—both connected to these remarkable animals.

The word "coral" refers to a group of sea animals (not plants) and, by extension, to the hard structures they build and even to a color. In biology, coral usually means colonies of tiny animals called polyps. Many corals live in warm, shallow seas, but some also grow in deeper, colder water. Reef-building corals make a hard calcium carbonate skeleton; as generations grow and die, these skeletons stack up and can form coral reefs. Reefs cover a small area of the ocean but support a huge variety of marine species, and they help protect coastlines while supporting fishing and tourism.

Beyond biology, "coral" also names a color: a warm pink-orange shade. You might describe a lipstick or a sunset as "coral," or see clothing dyed in this bright, friendly tone.

Coral has also been used for jewelry and decoration—especially so-called “precious coral,” where the polished hard skeleton is the material. Today, sourcing and protection matter because many reefs are under stress worldwide. The word comes from Greek korallion (via Latin), though its earlier origin is uncertain and may be Semitic. So, whether you’re picturing an underwater reef, a bead on a necklace, or a gentle color, "coral" ties back to these small animals and the worlds they help create.