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plane of symmetry

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Definition of plane of symmetry

1 : a plane through a crystal that divides the crystal into two parts that are mirror images of each other
2 : a vertical fore-and-aft plane that divides an airplane into symmetrical halves

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“Plane of symmetry.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/plane%20of%20symmetry. Accessed 15 December 2019.

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