English Words Starting With O

• owner-occupier

  nounC1
  /ˌəʊnər ˈɒkjʊpaɪə(r)/A person who lives in a property that they own.
• owner-operator

  nounMedium
  /ˌəʊ.nər ˈɒp.ə.reɪ.tər/A person or entity that both owns and operates a business or vehicle, especially a commercial vehicle like a truck, rather than leasing or hiring a driver.
• ownership

  nounB2
  /ˈəʊnəʃɪp/The state or fact of legally possessing and controlling something, such as an object, property, or idea.
• ownership flat

  nounC1
  /ˈəʊnəʃɪp ˌflæt/A self-contained residential unit within a larger building where the occupant owns the flat itself (a form of property title) but not the land or the structure's common parts, which are owned and managed collectively.
• owosso

  nounVery Low
  /əʊˈwɒsəʊ/The name of a city in Michigan, USA.
• owse

  nounExtremely rare/obsolete
  /aʊz/A dialectal or archaic term for cattle, particularly oxen.
• ox

  nounB2
  /ɒks/A large domesticated bovine animal kept for milk, meat, or draft work.
• ox-eye herring

  nounRare
  /ˌɒks ˌaɪ ˈherɪŋ/A small Atlantic fish species (Megalops atlanticus), known for its large, prominent eyes and herring-like appearance. It is also sometimes called 'tarpon', particularly in its juvenile stage.
• ox-tongue partisan

  nounExtremely rare / Archaic / Technical-historical
  /ˈɒks tʌŋ ˈpɑːtɪzæn/A historical polearm weapon, similar to a halberd or spear, with a long, wide, double-edged blade that is broad and pointed at the end, sometimes with a characteristic tongue-like shape.
• oxacillin

  nounC2
  /ˌɒksəˈsɪlɪn/A semi-synthetic penicillin antibiotic used to treat bacterial infections resistant to ordinary penicillin.
• oxalate

  nounC2
  /ˈɒk.sə.leɪt/A salt or ester of oxalic acid.
• oxalic acid

  nounC1+
  /ɒkˈsælɪk ˈæsɪd/A strong organic acid found in some plants, used industrially and known for forming insoluble salts (oxalates).
• oxalis

  nounLow
  /ˈɒksəlɪs/A plant of the genus Oxalis, typically having trifoliate leaves and small, often yellow, pink, or white flowers; commonly known as wood sorrel or shamrock.
• oxaloacetic acid

  nounLow
  /ˌɒksələʊəˈsiːtɪk ˈæsɪd/A four-carbon dicarboxylic acid intermediate in the Krebs cycle of cellular respiration.
• oxalosuccinic acid

  nounVery Low
  /ˌɒksələʊsəkˈsɪnɪk ˈæsɪd/A biochemical intermediate in the tricarboxylic acid (Krebs) cycle.
• oxazepam

  nounvery_low
  /ˌɒksəˈzɛpæm/A benzodiazepine derivative used medicinally as a sedative, anxiolytic, and hypnotic drug.
• oxazine

  nounC2 (Very Low Frequency)
  /ˈɒk.sə.ziːn/A heterocyclic compound containing one oxygen and one nitrogen atom in a six-membered ring, serving as the basic structure for a class of dyes and pharmaceuticals.
• oxblood

  adjectivenounC1-C2
  /ˈɒksblʌd/A dark, deep red colour, similar to that of dried blood, traditionally from an ox.
• oxbow

  nounC2/Rare
  /ˈɒks.bəʊ/A U-shaped bend in a river or stream that has become cut off from the main river channel, forming a lake.
• oxbow chest

  nounRare / Specialist
  /ˈɒksbəʊ tʃɛst/A large wooden storage trunk, traditionally with a curved, U-shaped lid resembling an oxbow.

Showing 3021–3040 of 3187 words.