单词	rotoflection axis
释义	rotoflection axis noun ro·​to·​flec·​tion axis ¦rōtō¦flekshən- : a compound symmetry element that requires identity of the structure and form of a crystal with its former configuration after a combination of rotation of 60, 90, 120, or 180 degrees with reflection across the plane normal to the axis Word History Etymology rotoflection from roto- + flection
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