English Words Starting With I

• ionian islands

  nounplural-nounC2
  /aɪˌəʊ.ni.ən ˈaɪ.ləndz/A group of islands in western Greece, in the Ionian Sea.
• ionian mode

  nounLow
  /aɪˈəʊ.nɪ.ən məʊd/A musical mode identical to the modern major scale.
• ionian sea

  nounLow
  /aɪˌəʊ.ni.ən ˈsiː/An elongated bay of the Mediterranean Sea, located between southern Italy (including Calabria and Sicily) and western Greece (including the Ionian Islands).
• ionic bond

  nounC1
  /aɪˈɒn.ɪk bɒnd/A chemical bond formed between two ions with opposite electrical charges, typically involving the transfer of electrons from a metal atom to a non-metal atom.
• ionium

  nounVery Low
  /aɪˈəʊnɪəm/A naturally occurring radioactive isotope of thorium, specifically thorium-230.
• ionization

  nounC1
  /ˌaɪ.ə.naɪˈzeɪ.ʃən/The process by which an atom or molecule gains or loses electrons, resulting in the formation of ions.
• ionization chamber

  nounC2
  /ˌaɪ.ə.naɪˈzeɪ.ʃən ˌtʃeɪm.bər/A device used to detect and measure ionizing radiation by measuring the electrical charge produced when radiation ionizes a gas inside the chamber.
• ionization potential

  nounLow (C2)
  /ˌaɪ.ə.naɪˈzeɪ.ʃən pəˌten.ʃəl/The minimum energy required to remove the most loosely bound electron from a neutral gaseous atom, molecule, or ion in its ground state.
• ionize

  verbverb-intransitiveverb-transitiveLow
  /ˈaɪ.ə.naɪz/To convert an atom, molecule, or substance into ions, typically by adding or removing electrons.
• ionizer

  nounLow
  /ˈaɪ.ə.naɪ.zə/A device that produces negative ions, often used to purify air by removing dust, allergens, and other particles.
• ionizing radiation

  nounC1/C2
  /ˈaɪ.ə.naɪ.zɪŋ ˌreɪ.diˈeɪ.ʃən/High-energy radiation with enough power to remove electrons from atoms or molecules, thereby ionizing them.
• ionogen

  nounVery low
  /aɪˈɒnədʒ(ə)n/A substance that can form ions.
• ionomer

  nounVery Low Frequency
  /aɪˈɒnəmə/A polymer containing ionic bonding groups in addition to covalent bonds.
• ionone

  nounVery Low
  /ˈaɪ.ə.nəʊn/A chemical compound with a violet-like scent, used in perfumery.
• ionopause

  nounExtremely Low (Technical/Specialist)
  /aɪˈɒn.ə(ʊ)ˌpɔːz/The boundary layer in Earth's (or another planet's) upper atmosphere where the ionosphere transitions to the more tenuous plasmasphere or interplanetary space.
• ionophore

  nounLow
  /ˈaɪ.ən.ə.fɔː(r)/A molecule that facilitates the transport of ions across a lipid membrane, such as a cell membrane.
• ionosonde

  nounVery Low (C2/Technical)
  /aɪˈɒn.əʊˌsɒnd/A ground-based radar instrument that measures the properties of the ionosphere.
• ionosphere

  nounLow
  /aɪˈɒn.ə.sfɪə/A region of Earth's upper atmosphere containing a high concentration of ions and free electrons.
• ionospheric wave

  nounC2/Professional
  /aɪˌɒn.əˈsfɛr.ɪk weɪv/A radio wave that is reflected or refracted back to Earth by the ionosphere.
• ionotropic receptor

  nounvery low
  /ˌaɪ.ə.nəʊˈtrɒp.ɪk rɪˈsep.tər/A membrane receptor protein that opens an ion channel upon binding a specific ligand, directly altering the electrical potential of a cell.

Showing 2921–2940 of 3621 words.