Relating to or characteristic of the coelenteron, the main body cavity of jellyfish and sea anemones.
From Greek koilos (hollow) + enteron (intestine). The term was coined in the 19th century to describe the unified digestive cavity of cnidarian organisms, combining ancient anatomical terminology with modern biological classification.
Sea anemones and jellyfish don't have a separate digestive system and stomach like we do—their entire body cavity is one big mouth-and-gut combo called a coelenteron, which is why this word literally means 'hollow intestine' in Greek.
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