• synonyms


[sem-i-sur-kuh l]
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  1. 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.
  2. 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
Related formssem·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. 2018

Related Words for semicircular

bowed, concave, convex, curved, crescentic, falcate, semicircular

Examples from the Web for semicircular

Historical Examples of semicircular

  • It terminates to the north in an arch and a semicircular apse in brick.

    Byzantine Churches in Constantinople

    Alexander Van Millingen

  • The door has eight panels besides the semicircular one at the top.

  • It was widest at the upper part, where it was semicircular, while the bottom was cut off straight.

  • The roofs are throughout of dark panelled wood and semicircular in shape.

    Portuguese Architecture

    Walter Crum Watson

  • Naturally it prepares an entrance; the form of this is semicircular.

British Dictionary definitions for semicircular


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

Word Origin and History for semicircular


early 15c., from Latin semicirculus (see semicircle) + -ar.

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1520s, from semi- + circle (n.) or else from Latin semicirculus.

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Online Etymology Dictionary, © 2010 Douglas Harper