A body cavity in animals, lined with tissue, that contains the internal organs; also spelled coelom.
From Greek koiloma meaning hollow or cavity. The word entered scientific terminology in the 1800s to describe this fundamental animal body structure.
Having a celom was a huge evolutionary breakthrough—it gave organs their own compartment with cushioning and space to move, which is why animals with celoms (like you!) are more complex than jellyfish!
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