WordReference Random House Unabridged Dictionary of American English © 2025
rota′tion ax′is, [Crystall.]
- Crystallographyan 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. Also called axis of symmetry, symmetry axis of rotation. Cf. symmetry element.
- 1900–05
'rotation axis' also found in these entries (note: many are not synonyms or translations):