Radial-symmetry meaning

Symmetrical arrangement of constituents, especially of radiating parts, about a central point.
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A form of symmetry in which identical parts are arranged in a circular fashion around a central axis.

A starfish has radial symmetry, a butterfly does not.

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Symmetrical arrangement of constituents, especially of radiating parts, about a central point.
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Symmetrical arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry.
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