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semicircle

[ sem-i-sur-kuhl ]
/ ˈsɛm ɪˌsɜr kəl /
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noun

Also called sem·i·cir·cum·fer·ence [sem-ee-ser-kuhm-fer-uhns, -fruhns, 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.

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Origin of semicircle

From the Latin word sēmicirculus, dating back to 1520–30. See semi-, circle
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. 2021

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
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
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