English Words Starting With O

• ombudsman

  nounC1/C2
  /ˈɒmbʊdzmən/An official appointed to investigate individuals' complaints against maladministration, especially by public authorities.
• ombudsperson

  nounC1-C2
  /ˈɒmbʊdzˌpɜːsən/An independent, impartial official appointed to investigate and resolve complaints made by citizens against public or private organisations.
• ombudswoman

  nounC2
  /ˈɒmbʊdzˌwʊmən/An official appointed to investigate and address complaints, especially from the public, against public authorities or private organisations; the female form of 'ombudsman'.
• omdurman

  nounRare
  /ˌɒm.də.ˈmɑːn/A major city in Sudan, situated on the western bank of the Nile River, opposite the capital Khartoum.
• omega

  nounC1
  /ˈəʊmɪɡə/The 24th and final letter of the Greek alphabet (Ω, ω).
• omega baryon

  nounC2/Highly Technical
  /ˈəʊmɪɡə ˈbarɪɒn/A subatomic particle that is a type of baryon, specifically a hyperon containing three strange quarks.
• omega meson

  nounVery Low (C2+)
  /ˈəʊmɪɡə ˈmiːzɒn/A short-lived subatomic particle, specifically a vector meson composed of a quark and an antiquark, with the same quantum numbers as the photon.
• omega minus

  nounC2
  /ˌəʊmɪɡə ˈmaɪnəs/The last and lowest; the absolute final or most extreme negative point.
• omega-3 fatty acid

  nounC1
  /ˌəʊmɪɡə ˌθriː ˈfæti ˈæsɪd/A type of polyunsaturated fat considered essential for human health, found in certain foods like fish and flaxseeds.
• omega-c baryon

  nounC2
  /ˌəʊmɪɡə ˈsiː ˈbærɪɒn/A type of subatomic particle belonging to the baryon family, specifically a charmed baryon with a specific quark composition (two strange quarks and one charm quark) and zero electric charge.
• omega-minus particle

  nounVery low frequency/Very specialized
  /ˌəʊmɪɡə ˈmaɪnəs ˌpɑːtɪk(ə)l/A type of subatomic particle known as a baryon, with a negative electric charge and a specific strangeness quantum number, classified as a hyperon.
• omelet

  nounB1
  /ˈɒm.lɪt/A dish made by beating eggs and cooking them in a frying pan, often folded around a filling.
• omelette

  nounCommon
  /ˈɒm.lət/A dish made from beaten eggs cooked in a frying pan, often folded around a filling such as cheese, vegetables, or meat.
• omen

  nounverbverb-transitiveC1
  /ˈəʊ.mən/An event or phenomenon believed to be a sign or warning of a future event, typically a bad one.
• omentum

  nounC1/C2
  /əʊˈmen.təm/A fold of the peritoneum (the lining of the abdominal cavity) that connects the stomach to other abdominal organs.
• omeprazole

  nounMedium
  /ˌəʊˈmɛprəzəʊl/A prescription medication belonging to a class of drugs called proton pump inhibitors (PPIs), used to reduce stomach acid production.
• omer

  nounVery Low
  /ˈəʊmə/An ancient Hebrew unit of dry measure equal to about 3.6 litres (approximately one-tenth of an ephah).
• omerta

  nounC1/C2 (Very low frequency)
  /ˌəʊmɛːˈtɑː/A code of silence or non-cooperation with authorities, especially by criminals or members of secret societies.
• omicron

  nounLow (except during pandemic coverage)
  /ˈɒmɪkrɒn/The 15th letter of the Greek alphabet (Ο, ο).
• omics

  nounLow in general language; Very High in specific scientific/medical contexts.
  /ˈəʊ.mɪks/A suffix forming nouns denoting a comprehensive study or set of related biological molecules in a field of biology (e.g., genomics, proteomics).

Showing 1081–1100 of 3187 words.