English Words Starting With N

• nuclear

  adjectivenounB2
  /ˈnjuː.klɪə(r)/Relating to the nucleus of an atom, or to the energy released when atomic nuclei are split or combined.
• nuclear bomb

  nounB2
  /ˈnjuː.kli.ə bɒm/A highly destructive explosive weapon that releases enormous energy from nuclear reactions—either fission (atomic bomb) or combined fission and fusion (thermonuclear/hydrogen bomb).
• nuclear chemistry

  nounLow
  /ˌnjuː.kli.ə ˈkem.ɪ.stri/The branch of chemistry dealing with nuclear reactions, radioactive substances, and atomic nuclei.
• nuclear emulsion

  nounC2
  /ˌnjuː.klɪər ɪˈmʌl.ʃən/A photographic film or plate specially coated with a thick, radiation-sensitive gel, used to detect and record the tracks of charged subatomic particles.
• nuclear energy

  nounB2
  /ˌnjuː.klɪə(r) ˈen.ə.dʒi/The energy released during nuclear reactions, either fission (splitting atoms) or fusion (combining atoms).
• nuclear family

  nounB2
  /ˌnjuː.kli.ə ˈfæm.əl.i/A family unit consisting of two parents and their children, living together independently from other relatives.
• nuclear fission

  nounC1/C2
  /ˌnjuː.klɪə ˈfɪʃ.ən/A nuclear reaction in which a heavy atomic nucleus splits into two or more lighter nuclei, releasing a large amount of energy.
• nuclear fuel

  nounC1/C2
  /ˈnjuː.kli.ə ˈfjuː.əl/Material that can sustain a nuclear fission chain reaction, used as the energy source in nuclear reactors.
• nuclear fusion

  nounC1
  /ˌnjuː.kli.ə ˈfjuː.ʒən/A nuclear reaction in which two light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy.
• nuclear isomer

  nounC2
  /ˌnjuː.kli.ər ˈaɪ.sə.mə/An excited, metastable state of an atomic nucleus that has a different energy level and longer lifetime than the ground state of the same nucleus.
• nuclear magnetic resonance

  nounC2
  /ˌnjuː.klɪə mæɡˌnet.ɪk ˈrez.ən.əns/A physical phenomenon in which atomic nuclei absorb and re-emit electromagnetic radiation in a magnetic field.
• nuclear magnetic resonance scanner

  nounC2
  /ˌnjuː.klɪə mæɡˌnet.ɪk ˈrez.ə.nəns ˈskæn.ər/A medical imaging device that uses strong magnetic fields and radio waves to generate detailed images of the inside of the body without using ionizing radiation.
• nuclear magneton

  nounExtremely Low
  /ˌnjuː.kli.ə ˈmæɡ.nɪ.tɒn/The natural unit for expressing the magnetic dipole moment of a nuclear particle.
• nuclear medicine

  nounC1/C2
  /ˌnjuː.kli.ə ˈmed.ɪ.sɪn/A medical specialty that uses radioactive substances (radiopharmaceuticals) to diagnose and treat diseases.
• nuclear membrane

  nounC1/C2 (Specialized)
  /ˌnjuː.klɪə ˈmem.breɪn/The double-layered lipid bilayer that surrounds the nucleus of a eukaryotic cell, separating its contents from the cytoplasm.
• nuclear option

  nounMedium
  /ˈnjuː.klɪər ˈɒp.ʃən/An extreme, last-resort action or strategy, typically one that has severe or irreversible consequences.
• nuclear physics

  nounC2
  /ˌnjuː.klɪə ˈfɪz.ɪks/The branch of physics that studies the constituents, forces, and structure of atomic nuclei.
• nuclear power

  nounHigh
  /ˈnjuː.klɪə ˈpaʊə/Electrical or motive power generated by the controlled release of energy from atomic nuclei, typically through nuclear fission.
• nuclear radiation

  nounLow in everyday contexts; high in scientific, academic, military, industrial, and news/political contexts.
  /ˈnjuː.klɪə ˌreɪ.diˈeɪ.ʃən/High-energy particles or electromagnetic waves emitted from the unstable nucleus of an atom during radioactive decay.
• nuclear reaction

  nounC1
  /ˌnjuː.klɪə.ɹi‿ɹiˈæk.ʃən/A process in which the nucleus of an atom is altered, either splitting into smaller nuclei (fission), combining with another nucleus (fusion), or undergoing other changes, releasing or absorbing energy.

Showing 3141–3160 of 3475 words.