semicircle

[ sem-i-sur-kuh l ]
/ ˈsɛm ɪˌsɜr kəl /

noun

Also called sem·i·cir·cum·fer·ence [sem-ee-ser-kuhm-fer-uh ns, -fruh ns, sem-ahy-] /ˌsɛm i sərˈkʌm fər əns, -frəns, ˌsɛm aɪ-/. half of a circle; the arc from one end of a diameter to the other.
anything having or arranged in the form of a half of a circle.

Origin of semicircle

From the Latin word sēmicirculus, dating back to 1520–30. See semi-, circle

Related forms

sem·i·cir·cu·lar [sem-i-sur-kyuh-ler] /ˌsɛm ɪˈsɜr kyə lər/, adjectivesem·i·cir·cu·lar·ly, adverbsem·i·cir·cu·lar·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for semicircle

British Dictionary definitions for semicircle

semicircle

/ (ˈsɛmɪˌsɜːkəl) /

noun

  1. one half of a circle
  2. half the circumference of a circle
anything having the shape or form of half a circle

Derived Forms

semicircular (ˌsɛmɪˈsɜːkjʊlə), adjectivesemicircularly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012