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    Cor·al
    /ˈkôrəl/

    noun

    • 1. a hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas: "a coral reef"
    • 2. 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.