English Words Starting With O

• oblong

  adjectivenounB2
  /ˈɒblɒŋ/A rectangle having its length longer than its width, or an elongated shape with four sides and four right angles.
• oblongata

  nounC2
  /mɪˌdʌlə ˌɒblɒŋˈɡɑːtə/A part of the brainstem, specifically the medulla oblongata, which controls vital autonomic functions.
• obloquy

  nounC2
  /ˈɒb.lə.kwi/Strong public criticism or verbal abuse; disgrace from such criticism.
• obmutescence

  nounExtremely rare/archaic
  /ˌɒbmjuːˈtɛs(ə)ns/The act of becoming or keeping silent; willful silence.
• obnounce

  verb-intransitiveExtremely Rare / Obsolete
  /ɒbˈnaʊns/(archaic/rare) To proclaim or announce something in a formal manner; to declare.
• obnubilate

  verbverb-transitiveVery low
  /ɒbˈnjuːbɪleɪt/To darken, obscure, or cloud over; to make unclear or indistinct.
• oboe

  nounC1
  /ˈəʊ.bəʊ/A woodwind musical instrument with a slender, cylindrical body and a double reed.
• oboe d'amore

  nounC2
  /ˌəʊbəʊ dæˈmɔːreɪ/A woodwind instrument of the oboe family, pitched a minor third lower than the standard oboe, with a pear-shaped bell that produces a warm, mellow, and slightly veiled tone.
• oboe d'amour

  nounC2+ (extremely rare)
  /ˌəʊbəʊ dæˈmʊə/A musical instrument of the woodwind family, essentially an alto oboe pitched a minor third lower than the standard oboe.
• oboe da caccia

  nounVery Low
  /ˈəʊbəʊ də ˈkætʃə/A musical instrument of the woodwind family
• oboist

  nounC1
  /ˈəʊ.bəʊ.ɪst/A musician who plays the oboe.
• obol

  nounC2
  /ˈɒb.əl/A small silver coin of ancient Greece.
• obole

  nounVery Low (Obsolete/Historical/Term of Art)
  /ˈɒb.əl/A small, historically obsolete coin of low value used in medieval France.
• obolus

  nounVery Low
  /ˈɒbələs/A small, ancient Greek silver coin.
• obote

  nounVery Low
  /əʊˈbəʊ.teɪ/Not a standard English word; appears as a proper noun referring to Milton Obote (1924–2005), the former President of Uganda.
• obrecht

  nounVery Low
  /ˈɒbrɛxt/A surname of Dutch origin, used as a proper noun.
• obregon

  nounUncommon
• obrenovic

  nounVery Low
  /ˌɒbrɛˈnɒvɪtʃ/A Serbian surname belonging to a former royal dynasty of Serbia.
• obrenovich

  nounVery Low
  /ɒˈbrɛnəvɪtʃ/A Serbian noble title denoting a member of the Obrenović dynasty.
• obreption

  nounVery rare
  /əʊˈbrɛpʃən/The act of obtaining something, especially a privilege or benefit, through deception or by concealing the truth.

Showing 181–200 of 3187 words.