English Words Starting With O

• olenek

  nounVery Low
  /ˈɒlɪnɛk/A proper noun referring to a major river in northern Siberia, Russia, flowing into the Laptev Sea.
• oleo

  combining-formnounLow
  /ˈəʊlɪəʊ/A butter substitute made from vegetable oils, sometimes mixed with animal fats; margarine.
• oleo oil

  nounLow (archaic/commercial)
  /ˈəʊlɪəʊ/A margarine or other food product made from vegetable oil, originally containing beef fat.
• oleo strut

  nounRare/Technical
  /ˈəʊlɪəʊ strʌt/A type of shock absorber, commonly used in aircraft landing gear, that uses oil and compressed air to absorb and dampen impact forces.
• oleograph

  nounC2
  /ˈəʊlɪə(ʊ)ɡrɑːf/A chromolithographic print textured to resemble an oil painting.
• oleomargarine

  nounLow
  /ˌəʊlɪəʊˈmɑːdʒəriːn/A spreadable food product originally made from animal fats, now primarily from hydrogenated vegetable oils, used as a substitute for butter.
• oleoresin

  nounC2
  /ˌəʊlɪə(ʊ)ˈrɛzɪn/A natural or prepared mixture of a resin and an essential oil, exuded from certain plants or trees.
• olericulture

  nounC1/C2
  /ˈɒlərɪˌkʌltʃə/The branch of horticulture concerned with the cultivation of vegetables for food.
• olestra

  nounLow
  /əʊˈlɛstrə/A synthetic fat substitute derived from sucrose and fatty acids that adds no fat or calories to food.
• olethreutid

  adjectivenounExtremely rare (specialist/technical)
  /ˌɒlɪˈθruːtɪd/A moth belonging to the family Olethreutidae (now typically considered a subfamily within Tortricidae), known as tortrix moths.
• oleum

  nounVery Low
  /ˈəʊlɪəm/A highly corrosive, fuming solution of sulfur trioxide in sulfuric acid.
• oleyl alcohol

  nounVery Rare / Technical
  /ˈəʊliːl ˈælkəhɒl/A long-chain, unsaturated fatty alcohol (C18H36O), derived from natural oils like olive or fish oil, used primarily as an emollient and surfactant in cosmetic and industrial formulations.
• olfaction

  nounC2
  /ɒlˈfæk.ʃən/the sense of smell; the act of smelling
• olfactometer

  nounVery Low
  /ˌɒlfækˈtɒmɪtə/A device for measuring the sensitivity of the sense of smell.
• olfactometry

  nounVery low (C2+)
  /ˌɒlfækˈtɒm.ɪ.tri/The science of measuring the sense of smell and the intensity of odours.
• olfactory

  adjectivenounC1
  /ɒlˈfæk.tər.i/relating to the sense of smell
• olfactory bulb

  nounC2/Technical
  /ɒlˈfæk.tər.i ˌbʌlb/A neural structure at the front of each brain hemisphere, involved in the sense of smell by receiving nerve input from the olfactory nerves.
• olfactory lobe

  nounC2
  /ɒlˈfæk.tər.i ləʊb/The part of the vertebrate brain (typically in the forebrain) that receives and processes nerve signals from the olfactory (smell) receptors.
• olfactory nerve

  nounC1/C2
  /ɒlˈfæk.tər.i nɜːv/The first cranial nerve (CN I), responsible for carrying smell sensations from the nose to the brain.
• olfactory tract

  nounC2/Highly Specialized
  /ɒlˈfæk.tər.i trækt/A bundle of nerve fibers that transmits smell information from the olfactory bulb to various brain regions.

Showing 961–980 of 3187 words.