cyclotomy

from The Century Dictionary.

• noun In surgery, operation for division of the ciliary muscle, practised to relieve tension in glaucoma.
• noun In mathematics, the theory of the partition of the circle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine surgical removal of the ciliary muscle; cyclicotomy
• noun mathematics the historical problems of dividing the circle into a given number of equal segments, and of constructing regular polygons
• noun mathematics the analytical extraction of the complex roots of unity; a de Moivre number