| 释义 |
ro·to·flec·tion axis
\|rōd.ō|flekshən-\ noun
Etymology: rotoflection from roto- + flection
: 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 |