English Words Starting With C

• cyclopedia

  nounC1
  /ˌsʌɪ.klə(ʊ)ˈpiː.dɪə/A comprehensive reference work providing concise information on a wide range of topics, traditionally arranged alphabetically.
• cyclopentadiene

  nounVery Low Frequency (C2+ Academic/Specialist Only)
  /ˌsaɪkləʊpɛntəˈdaɪiːn/A colourless, flammable, volatile liquid hydrocarbon (C5H6) with a formula containing a five-membered carbon ring and two double bonds.
• cyclopentane

  nounC2
  /ˌsʌɪklə(ʊ)ˈpɛnteɪn/A cyclic hydrocarbon with the chemical formula C₅H₁₀, consisting of a five-membered ring of carbon atoms, each bonded to two hydrogen atoms.
• cyclophosphamide

  nounLow
  /ˌsaɪ.kləʊˈfɒs.fə.maɪd/A powerful chemotherapy drug used to treat various cancers.
• cyclopia

  nounVery Rare
  /sʌɪˈkləʊpɪə/A congenital birth defect characterized by the failure of the embryonic forebrain to properly divide into two hemispheres, resulting in a single, central eye or eye socket, often accompanied by severe brain abnormalities.
• cycloplegia

  nounLow
  /ˌsʌɪklə(ʊ)ˈpliːdʒɪə/A temporary paralysis of the ciliary muscle of the eye, which controls the lens's ability to focus.
• cyclopropane

  nounC2+
  /ˌsaɪ.kləʊˈprəʊ.peɪn/The simplest cycloalkane, a saturated hydrocarbon with a molecular formula C₃H₆, consisting of three carbon atoms joined in a ring, each bonded to two hydrogen atoms.
• cyclops

  nounC1/C2
  /ˈsʌɪklɒps/In Greek mythology, a member of a race of one-eyed giants.
• cyclorama

  nounC2 (Very Low Frequency)
  /ˌsaɪ.kləʊˈrɑː.mə/A large curved wall or screen, often white, at the back of a stage, used to create the illusion of sky or distance, or to display background images.
• cyclosilicate

  nounVery low
  /ˌsʌɪklə(ʊ)ˈsɪlɪkət/A silicate mineral whose crystal structure contains rings of linked silicate tetrahedra (SiO₄ units).
• cyclosis

  nounVery Low
  /saɪˈkləʊsɪs/The circular streaming movement of cytoplasm within a plant or animal cell.
• cyclosporin

  nounLow
  /ˌsaɪklə(ʊ)ˈspɔːrɪn/A potent immunosuppressive drug derived from a fungus, used to prevent organ transplant rejection and treat autoimmune diseases.
• cyclosporine

  nounLow/Very Low (Specialized)
  /ˌsaɪ.klə(ʊ)ˈspɔː.riːn/A powerful immunosuppressant drug used to prevent organ transplant rejection and treat autoimmune diseases.
• cyclostome

  adjectivenounC2
  /ˈsʌɪklə(ʊ)stəʊm/A primitive, jawless fish of the class Cyclostomata, which includes lampreys and hagfish.
• cyclostyle

  nounverbVery Rare / Historical / Technical
  /ˈsaɪklə(ʊ)staɪl/A duplicating machine that uses a rotating toothed wheel to puncture a stencil and then transfer ink through the holes onto paper.
• cyclothymia

  nounLow
  /ˌsʌɪklə(ʊ)ˈθʌɪmɪə/A chronic mood disorder characterized by numerous periods of mild depression and hypomania, less severe than bipolar disorder.
• cyclotome

  nounExtremely Rare
  /ˈsʌɪklə(ʊ)təʊm/A surgical instrument used for cutting the ciliary muscle of the eye.
• cyclotomy

  nounVery Low
  /saɪˈklɒtəmi/The mathematical operation of dividing a circle into a specific number of equal parts, or roots of unity.
• cyclotrimethylenetrinitramine

  nounVery Low (Specialised/Technical)
  /ˌsaɪkləʊtraɪˌmɛθɪliːntraɪˈnaɪtrəmiːn/The systematic chemical name for a powerful crystalline high explosive, commonly known as RDX.
• cyclotron

  nounLow (C2, Technical)
  /ˈsaɪ.klə.trɒn/A particle accelerator in which charged subatomic particles, such as protons or electrons, are propelled in a spiral path by an alternating electric field within a constant magnetic field.

Showing 13541–13560 of 13732 words.