WordReference Random House Unabridged Dictionary of American English © 2017
hem•i•cy•cle  (hemi sī′kəl),USA pronunciation n. 
  1. a semicircle.
  2. a semicircular structure.
  3. Timehemicyclium.
hem•i•cy•clic  (hem′i sīklik, -siklik),USA pronunciation adj. 
  • Greek hēmikýklion See hemi-, cycle
  • Latin hēmicyclium
  • French hémicycle
  • 1595–1605;

'hemicycle' also found in these entries:

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