English Words Starting With O

• obstipation

  nounVery Low
  /ˌɒbstɪˈpeɪʃ(ə)n/A medical condition of severe, persistent, and often complete constipation.
• obstruct

  verbverb-transitiveB2
  /əbˈstrʌkt/To block or get in the way of something, making movement or progress difficult or impossible.
• obstruction

  nounB2
  /əbˈstrʌkʃ(ə)n/Something that blocks a passage, prevents movement or progress, or causes an obstruction.
• obstructionist

  nounC1/C2
  /əbˈstrʌk.ʃən.ɪst/A person who deliberately delays or prevents progress, especially in political or administrative processes.
• obstruent

  adjectivenounC2
  /ˈɒb.strʊ.ənt/A phoneme (speech sound) produced by obstructing the airflow in the vocal tract, such as stops, fricatives, and affricates (e.g., /p/, /s/, /tʃ/).
• obtain

  verbverb-intransitiveverb-transitiveB2
  /əbˈteɪn/To get, acquire, or secure something, usually through effort or a process.
• obtaining by deception

  nounC1/C2
  /əbˈteɪnɪŋ baɪ dɪˈsɛpʃən/A legal and formal term for the act of gaining possession of property, money, or a benefit through dishonest means or trickery.
• obtemper

  verbExtremely Rare / Archaic
  /ɒbˈtɛmpə/ or /əbˈtɛmpə/To obey a command, rule, or law; to comply with.
• obtest

  verbverb-intransitiveverb-transitiveVery Rare/Archaic
  /ɒbˈtɛst/to beseech or implore someone solemnly, often calling something or someone as witness.
• obtrude

  verbverb-intransitiveverb-transitiveLow
  /əbˈtruːd/To force oneself or one's ideas on others in an unwelcome, noticeable, or intrusive manner.
• obtrusion

  nounC1
  /əbˈtruː.ʒən/The act of imposing oneself or one's ideas on others in an unwelcome or intrusive manner.
• obtund

  verbverb-transitiveC2/Rare
  /əbˈtʌnd/To dull or reduce the sharpness or intensity of (a sensation, feeling, or pain); to blunt.
• obtunded

  adjectiveverbVery Low
  /əbˈtʌndɪd/Dulled; having reduced mental or physical sharpness; blunted.
• obturate

  verbverb-transitiveVery low
  /ˈɒb.tjʊə.reɪt/To block or close up, especially an opening or passage.
• obtuse angle

  nounLow-medium
  /əbˌtjuːs ˈæŋ.ɡəl/A geometrical angle that measures greater than 90 degrees and less than 180 degrees.
• obtuse triangle

  nounLow
  /əbˌtjuːs ˈtraɪæŋɡl/A triangle with one angle greater than 90 degrees (but less than 180 degrees).
• obtuseness

  nounC1
  /əbˈtjuːsnəs/The quality of being slow to understand or perceive things; lack of sharpness or intelligence.
• obuda

  nounC2
  /ˈɒbʊdə/The historical name for the third and oldest district of modern Budapest, Hungary. It is not a standard English word but a proper noun referring to a specific place.
• obumbrate

  adjectiveverb-transitiveVery Low
  /ˈɒbʌmbreɪt/To overshadow; to darken.
• obverse

  adjectivenounC1
  /ˈɒbvɜːs/The front or principal side of something, especially of a coin or medal bearing the main design; the counterpart or opposite of a fact or truth.

Showing 241–260 of 3187 words.