English Words Starting With O

• organ whistle

  nounVery Low (Technical)
  /ˈɔː.ɡən ˈwɪs.əl/A specific type of organ pipe that produces a clear, flute-like sound by causing a column of air to vibrate.
• organ-pipe cactus

  nounRare
  /ˌɔː.ɡən.paɪp ˈkæk.təs/A tall, columnar cactus native to Mexico and the southwestern United States, characterized by multiple vertical stems that resemble organ pipes.
• organ-pipe coral

  nounRare / Technical
  /ˈɔː.ɡən paɪp ˈkɒr.əl/A marine coral of the genus Tubipora, characterised by its red skeleton composed of parallel calcareous tubes resembling the pipes of a church organ.
• organa

  nounC2
  /ɔːˈɡɑːnə/Plural of organum; archaic, scholarly, or historical plural of organ; referring to early medieval forms of polyphony or, rarely, multiple musical instruments.
• organdie

  nounLow
  /ˈɔː.ɡən.di/A very fine, stiff, transparent, and crisp cotton muslin fabric.
• organdy

  nounLow
  /ˈɔːɡəndi/A thin, stiff, transparent cotton muslin fabric.
• organelle

  nounLow-Frequency
  /ˌɔː.ɡənˈɛl/A specialized structure within a living cell that performs a specific function.
• organic

  adjectivenounC1
  /ɔːˈɡæn.ɪk/Relating to or derived from living matter; involving natural processes without the use of synthetic chemicals.
• organic chemistry

  nounLow-Medium
  /ɔːˌɡænɪk ˈkemɪstri/The branch of chemistry that studies carbon-containing compounds, especially hydrocarbons and their derivatives.
• organic disease

  nounC1-C2 / Low Frequency
  /ɔːˌɡæn.ɪk dɪˈziːz/A medical condition caused by structural, demonstrable changes in bodily organs or tissues, as opposed to one of purely mental or functional origin.
• organic light-emitting diode

  nounLow
  /ɔːˌɡæn.ɪk ˌlaɪt.ɪˈmɪt.ɪŋ ˈdaɪ.əʊd/A type of light source that uses a thin layer of organic compounds to emit light when an electric current is passed through it.
• organic psychosis

  nounLow (C2)
  /ɔːˌɡænɪk saɪˈkəʊsɪs/A severe mental disorder, involving a loss of contact with reality (psychosis), caused by a known physical illness or brain injury, rather than a purely psychological or functional cause.
• organic solidarity

  nounC1
  /ɔːˌɡæn.ɪk ˌsɒl.ɪˈdær.ə.ti/A concept in sociology describing social cohesion based on interdependence resulting from the division of labour, where individuals perform different roles that are necessary for the functioning of society.
• organicism

  nounVery Rare / C2
  /ɔːˈɡænɪsɪz(ə)m/A doctrine or worldview that considers living systems (organisms, societies, etc.) as integrated wholes, where the whole is more than the sum of its parts.
• organist

  nounC1
  /ˈɔː.ɡən.ɪst/A person who plays the organ, especially in a church or for religious services.
• organization

  adjectivenounHigh
  /ˌɔː.ɡən.aɪˈzeɪ.ʃən/A group of people who work together in a structured way to achieve a common purpose or goal.
• organization chart

  nounB2
  /ˌɔː.ɡən.aɪˈzeɪ.ʃən ˌtʃɑːt/A diagram that shows the structure of an organization and the relationships and relative ranks of its parts and positions.
• organization for economic cooperation and development

  nounC2
  /ˌɔː.ɡən.aɪˈzeɪ.ʃən fɔː(r) ˌiː.kəˈnɒm.ɪk kəʊˌɒp.əˈreɪ.ʃən ənd ˌdiːˈvel.əp.mənt/An international economic organization of 38 member countries, founded in 1961, that works to promote policies to improve economic and social well-being globally.
• organization for european economic cooperation

  nounVery Low (C2/Historical)
  /ˌɔːɡənaɪˈzeɪʃən fər ˌjʊərəˈpiːən ˌiːkəˈnɒmɪk kəʊˌɒpəˈreɪʃən/A former international organization, established in 1948, to coordinate and administer the post-World War II Marshall Plan for European economic recovery and to foster economic cooperation among its member countries.
• organization man

  nounC1/C2
  /ˌɔːɡənaɪˈzeɪʃən ˈmæn/A person, typically a male white-collar worker, who subordinates his individuality and personal goals to the demands and values of the large corporation or bureaucratic organization he works for.

Showing 1861–1880 of 3187 words.