English Words Starting With O

• oxford theory

  nounC1
  /ˈɒksfəd ˈθɪəri/An academic or philosophical proposition associated with the intellectual tradition, scholars, or formal processes of the University of Oxford.
• oxfordshire

  nounC2
  /ˈɒksfədʃə/A ceremonial and historic county in south-central England, containing the historic city of Oxford.
• oxheart

  nounC2 - Very Low Frequency
  /ˈɒks.hɑːt/A large, heart-shaped variety of cherry, or a specific variety of plum.
• oxhide

  nounLow (C2)
  /ˈɒkshaɪd/The skin of an ox, especially when treated and used as leather.
• oxidane

  nounVery low
  /ˈɒksɪdeɪn/The systematic IUPAC name for the chemical compound with the formula H₂O; water.
• oxidant

  nounC1
  /ˈɒksɪd(ə)nt/A chemical substance that causes another substance to lose electrons (oxidize).
• oxidant smog

  nounC1/C2
  /ˈɒksɪd(ə)nt smɒɡ/A type of air pollution, common in sunny urban areas, formed by chemical reactions between sunlight and pollutants like nitrogen oxides and volatile organic compounds.
• oxidase

  nounLow
  /ˈɒksɪdeɪz/An enzyme that catalyses an oxidation-reduction reaction, specifically using oxygen as the electron acceptor.
• oxidate

  nounverb-ambitransitiveLow
  /ˈɒksɪdeɪt/To combine chemically with oxygen; to undergo a reaction where oxygen is added or electrons are lost.
• oxidation

  nounC1/C2
  /ˌɒksɪˈdeɪʃ(ə)n/A chemical process in which a substance combines with oxygen, often resulting in rusting, tarnishing, or the loss of electrons.
• oxidation potential

  nounC2
  /ˌɒksɪˈdeɪʃən pəˈtɛnʃəl/A quantitative measure of the tendency of a chemical species to lose electrons and undergo oxidation.
• oxidation state

  nounC2
  /ˌɒk.sɪˈdeɪ.ʃən steɪt/A number assigned to an element in a chemical compound that represents the number of electrons lost or gained by an atom of that element.
• oxidation-reduction

  adjectivenounVery Low
  /ˌɒk.sɪˌdeɪ.ʃən rɪˈdʌk.ʃən/A chemical reaction in which electrons are transferred between species, involving one substance being oxidized (losing electrons) and another being reduced (gaining electrons).
• oxidative phosphorylation

  nounVery low
  /ˌɒks.ɪ.deɪ.tɪv ˌfɒs.fər.ɪˈleɪ.ʃən/The metabolic pathway in cells that uses the electron transport chain to generate ATP, the energy currency of the cell.
• oxide

  nounC1
  /ˈɒksaɪd/A chemical compound of oxygen with another element or group.
• oxidimetry

  nounVery low
  /ˌɒksɪˈdɪmɪtri/The measurement of the amount of oxidizing agent in a solution.
• oxidize

  verbverb-intransitiveverb-transitiveC1
  /ˈɒk.sɪ.daɪz/To undergo or cause to undergo a chemical reaction with oxygen, leading to a loss of electrons.
• oxidizer

  nounLow (C2)
  /ˈɒk.sɪ.daɪ.zə/A substance that causes another substance to lose electrons (oxidize) by providing oxygen or accepting electrons.
• oxidizing agent

  nounC2
  /ˈɒk.sɪ.daɪ.zɪŋ ˈeɪ.dʒənt/A substance that accepts electrons from another substance (the reducing agent) during a redox reaction, thereby causing that substance to be oxidized.
• oxidoreductase

  nounVery Low
  /ˌɒksɪdəʊrɪˈdʌkteɪz/An enzyme that catalyzes a reaction involving the simultaneous transfer of electrons (a redox reaction).

Showing 3061–3080 of 3187 words.