English Words Starting With O

• oxime

  nounC2
  /ˈɒksiːm/An organic compound containing a C=NOH functional group, typically formed by the reaction of hydroxylamine with an aldehyde or ketone.
• oximeter

  nounC1
  /ɒkˈsɪm.ɪ.tər/A device used for measuring the oxygen saturation in the blood.
• oximetry

  nounLow
  /ɒkˈsɪm.ɪ.tri/The measurement of the oxygen saturation level in a person's blood, typically using a sensor.
• oxisol

  nounVery Low (Technical/Specialist)
  /ˈɒksɪsɒl/A type of highly weathered soil found in tropical and subtropical regions, rich in iron and aluminum oxides and characterized by low natural fertility.
• oxlip

  nounRare / Scientific
  /ˈɒkslɪp/A wild primula, a plant with pale yellow flowers that grows in woodland.
• oxnard

  nounLow
  /ˈɒks.nɑːd/A city in Ventura County, California, United States.
• oxo

  nounC1
  /ˈɒksəʊ/A trademark for a brand of stock cubes, gravy powders, and other food flavourings, especially in the UK.
• oxo acid

  nounRare/Very Low
  /ˈɒksəʊ ˌæsɪd/An acid in which the acidic hydrogen atom(s) are bonded to an oxygen atom that is attached to a central atom (e.g., in a carbonyl group).
• oxo process

  nounVery Low
  /ˈɒksəʊ ˌprəʊsɛs/An industrial chemical process for producing aldehydes from alkenes, carbon monoxide, and hydrogen, using a catalyst.
• oxon hill

  nounVery Low
  /ˈɒksən hɪl/A proper noun referring to a specific census-designated place (CDP) in Prince George's County, Maryland, USA, near Washington D.C.
• oxonian

  adjectivenounLow
  /ɒkˈsəʊ.ni.ən/Relating to Oxford University or the city of Oxford.
• oxonium compound

  nounC2
  /ɒkˈsəʊ.ni.əm ˈkɒm.paʊnd/A chemical species in which oxygen bears a positive formal charge, typically represented as R3O+, where R can be hydrogen or an organic group.
• oxpecker

  nounLow
  /ˈɒkspɛkə/An African bird that feeds on ticks and other parasites found on large mammals.
• oxtail

  nounLow
  /ˈɒksteɪl/The tail of an ox, used as food.
• oxter

  nounC1+
  /ˈɒkstə(r)/The armpit.
• oxtongue

  nounC2 / Very Rare
  /ˈɒkstʌŋ/The tongue of an ox (cattle), used as food.
• oxus

  nounVery Low
  /ˈɒksəs/The classical name for the Amu Darya river, a major river in Central Asia.
• oxyacetylene

  adjectivenounC2
  /ˌɒksɪəˈsɛtɪliːn/A mixture of oxygen and acetylene, used in a torch for high-temperature flame cutting and welding of metals.
• oxyacid

  nounC1
  /ˌɒk.siˈæs.ɪd/An acid containing oxygen, typically as part of a hydroxyl group (OH), bonded to another central element.
• oxyaldehyde

  nounRare/Technical
  /ˌɒksiˈældɪhaɪd/A chemical compound containing both aldehyde (–CHO) and hydroxyl (–OH) functional groups.

Showing 3081–3100 of 3187 words.