an imaginary line through a crystal about which the crystal may be rotated a specified number of degrees and be brought back to its original position.
- Rotation flap
rotation flap n. A pedicle flap rotated from the donor site to an adjacent recipient area, usually as a direct flap.
- Rotation-inversion axis
[roh-tey-shuh n in-vur-zhuh n, -shuh n] /roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən/ noun, Crystallography. 1. an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position.
[ak-seez] /ˈæk siz/ noun, Mathematics. 1. a process of replacing the axes in a Cartesian coordinate system with a new set of axes making a specified angle with and having the same origin as the original axes.
- Rotations per minute
revolutions per minute