资料来源 : pyDict

半圆形

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Semicircle \Sem"i*cir`cle\, n.
   1.
      (a) The half of a circle; the part of a circle bounded by
          its diameter and half of its circumference.
      (b) A semicircumference.

   2. A body in the form of half of a circle, or half of a
      circumference.

   3. An instrument for measuring angles.

资料来源 : WordNet®

semicircle
     n : a plane figure with the shape of half a circle [syn: {hemicycle}]