Relating to or resembling the coelom, a body cavity found in many animals.
From Greek koilos 'hollow' plus the suffix -ar, directly describing things pertaining to hollow internal body spaces.
The coelom is biology's way of saying 'animal trunk'—it's the internal cavity where organs hang out like passengers in a bus, and it's a major reason animals evolved from simple flat creatures into complex 3D beings.
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