Plural of coelenterate; multiple members of the group of simple marine animals with hollow body cavities.
Plural form of 'coelenterate,' from Greek 'koilos' (hollow) + 'enteron' (intestine). The '-s' ending simply marks it as plural.
When you're at an aquarium watching jellyfish drift around, you're looking at creatures that have survived for over 500 million years with minimal changes to their design.
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