WordReference Random House Unabridged Dictionary of American English © 2026
reflec′tion plane′, [Crystall.]
  1. Crystallographya plane through a crystal that divides the crystal into two halves that are mirror images of each other. Also called symmetry plane. Cf. symmetry element. 
  • 1970–75

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'reflection plane' also found in these entries (note: many are not synonyms or translations):
symmetry element - symmetry plane

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