English Words Starting With O

• oxygenator

  nounLow
  /ˈɒksɪdʒəneɪtə/A device or mechanism that adds oxygen to a liquid or gas.
• oxygenize

  verb-transitiveLow
  /ˈɒksɪdʒənʌɪz/To combine or treat with oxygen; to oxidize.
• oxyhaemoglobin

  nounRare
  /ˌɒksɪˌhiːmə(ʊ)ˈɡləʊbɪn/The bright red compound formed when haemoglobin in red blood cells binds with oxygen.
• oxyhemoglobin

  nounVery Low
  /ˌɒksɪˌhiːməˈɡləʊbɪn/The bright red form of hemoglobin that is produced when hemoglobin binds with oxygen in the lungs.
• oxyhydrogen

  adjectivenounRare
  /ˌɒksɪˈhaɪdrədʒən/A mixture of oxygen and hydrogen gases.
• oxymetazoline

  nounLow
  /ˌɒksɪmɛtəˈzəʊliːn/A vasoconstrictor drug used as a nasal decongestant.
• oxymoron

  nounC1
  /ˌɒksɪˈmɔːrɒn/A figure of speech that combines two contradictory or opposing ideas for rhetorical effect.
• oxymorphone

  nounC1
  /ˌɒksɪˈmɔːfəʊn/A very strong semi-synthetic opioid drug used for pain relief.
• oxyneurine

  nounVery Low / Obsolete
  /ˌɒksɪˈnjʊəriːn/A chemical compound, specifically betaine, which is a derivative of amino acids found in plants and animals.
• oxysalt

  nounVery Rare / C2+
  /ˈɒksiˌsɔːlt/A salt of an oxyacid; a chemical compound in which one or more hydrogen atoms of an oxyacid have been replaced by a metal or other positive ion.
• oxysulfide

  nounExtremely Low
  /ˌɒksɪˈsʌlfaɪd/A chemical compound containing oxygen and sulfur, typically a sulfide in which some sulfur atoms are replaced by oxygen.
• oxysulphide

  nounVery Low
  /ˌɒksɪˈsʌlfaɪd/A chemical compound containing oxygen and sulfur, with sulfur typically in a reduced state (sulphide).
• oxytetracycline

  nounC2
  /ˌɒksɪˌtɛtrəˈsaɪkliːn/An antibiotic medication used to treat a wide range of bacterial infections.
• oxytocia

  nounVery Low
  /ˌɒksɪˈtəʊsɪə/Rapid childbirth or labor.
• oxytocic

  adjectivenounVery Low
  /ˌɒksɪˈtəʊsɪk/A drug or agent that stimulates uterine contractions, used to induce labour or control postpartum bleeding.
• oxytocin

  nounC1
  /ˌɒksɪˈtəʊsɪn/A hormone produced in the brain that plays key roles in childbirth, breastfeeding, and social bonding.
• oxytone

  adjectivenounLow (specialist/technical term)
  /ˈɒksɪtəʊn/A word with stress or accent on its final syllable.
• oxyuriasis

  nounLow
  /ˌɒksɪjʊˈraɪəsɪs/An intestinal infection caused by pinworms, specifically threadworms of the genus Oxyuris.
• oyama

  nounVery Low
  /əʊˈjɑːmə/A proper noun, typically a Japanese surname or the name of a specific mountain (especially Mount Oyama).
• oyashio current

  nounC2
  /ˌɔɪ.əˈʃiː.əʊ ˈkʌr.ənt/A cold, southward-flowing ocean current in the northwestern Pacific Ocean, originating in the Arctic Ocean and flowing along the east coast of the Kamchatka Peninsula and the Kuril Islands.

Showing 3121–3140 of 3187 words.