Definition of semicircle in English:


Syllabification: sem·i·cir·cle
Pronunciation: /ˈsemēˌsərkəl, ˈsemˌī-


  • 1A half of a circle or of its circumference.
    More example sentences
    • It is a complete circle and then down on the bottom half there is a semicircle with a little circle above it.
    • His point is well taken, for if circles were defined in terms of semicircles, then presumably semicircles would be defined in terms of the quarter-circles of which they are composed, and so on, ad infinitum.
    • It is well burnished only on the exterior body, which is decorated with a series of engraved ticked circles and semicircles.
  • 1.1A set of objects arranged in a semicircle: chairs were in a semicircle around the hearth
    More example sentences
    • The patara ruin has rows of stone seats arranged in a semicircle, like the chambers of the American Congress.
    • I'm sat in one of those chairs with a little side table to rest your notebook on, arranged in a semicircle in a darkened room.
    • Tables have been arranged in a semicircle around the bench rather than in the normal linear fashion.



More example sentences
  • A semicircular plug to be fitted in a semicircular recess formed in either end of a cylinder head of an overhead cam shaft engine for preventing leakage of lubricating oil.
  • For those that appreciate architecture and design, a semicircular brick patio may add just the right touch of personality to a backyard.


early 16th century: from Latin semicirculus (see semi-, circle).

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elaborate ornamentation of a vocal melody