noun, plural: symmetries

Correspondence of parts (in terms of form, size, distribution, or arrangement) on opposite sides of a dividing plane or on sides around an axis


In biology, symmetry pertains to an attribute of organisms showing regularity in parts on a plane or around an axis. Symmetry may be:

  • bilateral symmetry – symmetry in which the opposite sides are similar; the external appearance is the same on the left and right sides in a sagittal plane (such as the body plan of most animals, including humans)
  • radial symmetry – symmetry in which the sides exhibit correspondence or regularity of parts around a central axis; lacking left and right sides (e.g. sea stars, sea anemones, jellyfish, sea urchins, and many flowers)

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