English Words Starting With I

• iodism

  nounVery Low / Technical
  /ˈaɪ.ə.dɪ.zəm/A pathological condition resulting from excessive iodine intake, characterized by specific symptoms.
• iodize

  verbverb-transitiveC1
  /ˈaɪ.ə.daɪz/To treat, impregnate, or combine with iodine or an iodide.
• iodoform

  nounRare
  /aɪˈəʊdəfɔːm/A yellow crystalline compound with antiseptic properties, chemical formula CHI₃.
• iodometry

  nounC2
  /ˌaɪ.əˈdɒm.ə.tri/A chemical analytical technique using iodine for quantitative measurement, typically determining the concentration of oxidising or reducing agents.
• iodophor

  nounLow/Very Low (C2+)
  /ˈaɪ.ə.də(ʊ)ˌfɔː/A chemical compound consisting of iodine complexed with a carrier (e.g., a surfactant), used for its sustained antiseptic properties.
• iodopsin

  nounVery low (specialist term)
  /ˌaɪəˈdɒpsɪn/A light-sensitive protein pigment found in the cone cells of the retina, responsible for color vision.
• iolanthe

  nounVery low
  /aɪəˈlænθi/A proper noun, primarily referring to the title character of the 1882 Gilbert and Sullivan comic opera 'Iolanthe; or, The Peer and the Peri'.
• iolite

  nounVery low
  /ˈaɪəˌlaɪt/A mineral, a variety of cordierite, typically blue-violet, used as a gemstone.
• ion

  nounB2
  /ˈaɪ.ɒn/An atom or molecule that has gained or lost one or more electrons, giving it a net positive or negative electrical charge.
• ion engine

  nounC1/C2 (Specialised)
  /ˈaɪ.ɒn ˈen.dʒɪn/A propulsion system for spacecraft that uses electrically charged particles (ions) as reaction mass, accelerated to generate thrust.
• ion exchange

  nounC1
  /ˌaɪ.ən ɪksˈtʃeɪndʒ/A reversible chemical process in which ions of one substance are exchanged for similarly charged ions of another substance, typically between a solid resin and a solution.
• ion generator

  nounC1/C2
  /ˈaɪ.ɒn ˌdʒɛn.ə.reɪ.tə/A device that produces charged atoms or molecules (ions), typically for air purification or static charge neutralisation.
• ion implantation

  nounC1
  /ˌaɪ.ɒn ˌɪm.plɑːnˈteɪ.ʃən/A technical process where ions of a material are accelerated and embedded into a solid target (substrate) to modify its surface properties.
• ion propulsion

  nounC2
  /ˈaɪ.ɒn prəˈpʌl.ʃən/A method of spacecraft propulsion that creates thrust by accelerating ions using electricity.
• ion rocket

  nounC2
  /ˈaɪ.ɒn ˈrɒk.ɪt/A spacecraft propulsion system that generates thrust by accelerating ions using electric fields.
• ion trap

  nounLow
  /ˈaɪ.ɒn ˌtræp/A device or technique used to confine charged particles (ions) using electric or magnetic fields for study or manipulation.
• iona

  nounLow
  /aɪˈəʊnə/A proper noun, primarily a place name referring to a small island in the Inner Hebrides of Scotland.
• ionesco

  nounC1
  /ˌjɒnˈɛskəʊ/A proper noun referring to Eugène Ionesco (1909–1994), a Romanian-French playwright and a major figure in the Theatre of the Absurd.
• ionia

  nounLow
  /aɪˈəʊnɪə/An ancient region on the western coast of Anatolia (modern-day Turkey), inhabited by Ionian Greeks.
• ionian

  adjectivenounLow
  /aɪˈəʊnɪən/Relating to or belonging to the ancient Greek region of Ionia.

Showing 2901–2920 of 3621 words.