A sea anemone, particularly a genus of marine animals with tentacle-like structures arranged radially around a central mouth.
From Greek aktis meaning 'ray,' referring to the radial arrangement of the tentacles around the central opening; the scientific name became applied to anemone organisms.
The name 'actinia' perfectly describes what you see when you look at a sea anemone—rays of tentacles spreading outward from the center like petals or fingers, which is exactly why ancient Greeks called them 'ray-animals'!
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