Semicircle Circle Half Noun Form Semi Semicircular Semicirculus

semi·cir·cle
\\ˈse-mē-ˌsər-kəl, ˈse-ˌmī-, -mi-\\ noun1. a half of a circle
2. an object or arrangement of objects in the form of a half circle
• semi·cir·cu·lar \\ˌse-mē-ˈsər-kyə-lər\\ adjective

semicircle
  1520s, from semi- + circle. Semicircular is attested from early 15c.

semicircle
semi·circle / 5semisE:kl; NAmE -sE:rkl / noun1. (geometry 几何) one half of a circle
   半圆
2. the line that forms the edge of a semicircle
   半圆弧线
3. a thing, or a group of people or things, shaped like a semicircle
   半圆形:
   a semicircle of chairs
   摆成半圆形的椅子
   We sat in a semicircle round the fire.
   我们坐在炉火前,围成一个半圆形。
• semi·cir·cu·lar / 7semi5sE:kjElE(r); NAmE -5sE:rk- / adj.:
   a semicircular driveway
   半圆形车道

semicircle noun

semi·circle
I. \ˈ ̷ ̷(ˌ) ̷ ̷+ˌ-\ noun
Etymology: Latin semicirculus, from semi- + circulus circle — more at
1.
 a. : the part of a circle from one end of a diameter to the other : an arc equal to one half of a circumference : half circle — called also semicircumference
 b. : either half of a circular area divided diametrically
2. : a body, formation, or arrangement of objects in the form of half of a circle or half of a circumference
3. : an instrument of semicircular form used especially for measuring angles
II. transitive verb
: to form or throw into a semicircle : surround with a semicircle
 < the port semicircles a blue bay — Sylvia Martin >
intransitive verb
: to become a semicircle : move in a semicircle

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