a hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas

a coral reef

the nearby coral islands, lagoons, and atolls

a sedentary coelenterate of warm and tropical seas, with a calcareous, horny, or soft skeleton. Most corals are colonial and many rely on the presence of green algae in their tissues to obtain energy from sunlight

the unfertilized roe of a lobster or scallop, which is used as food and becomes reddish when cooked

we had scallops with their coral, in their fluted shells