English Words Starting With O

• ordination

  nounC1
  /ˌɔː.dɪˈneɪ.ʃən/The ceremony or process of formally appointing someone as a priest, minister, or rabbi.
• ordnance

  nounC2
  /ˈɔːd.nəns/Military weapons, ammunition, and artillery, especially heavy guns.
• ordnance datum

  nounVery Low
  /ˈɔːdnəns ˈdeɪtəm/A vertical reference point, or mean sea level, established by a national mapping agency as the basis for measuring heights and altitudes on maps and surveys.
• ordnance survey

  nounC1
  /ˈɔːdnəns ˈsɜːveɪ/The national mapping agency of Great Britain, responsible for producing detailed and authoritative maps.
• ordo

  nounVery Low (C2+)
  /ˈɔː.dəʊ/In Christian liturgy, a prescribed book containing the texts and ceremonies for the Mass and Divine Office, or more broadly, an authoritative order or arrangement, especially of a religious nature.
• ordonez

  nounVery Low
  /ɔːˈdɒneθ/A Spanish surname of patronymic origin, meaning 'son of Ordoño'.
• ordonnance

  nounC2
  /ˈɔː.də.nəns/A plan or arrangement of parts, especially in art, architecture, or writing; a systematic layout or ordering.
• ordos

  nounLow
  /ˈɔːdɒs/A plural form of 'ordo', referring to a body of people living under a religious rule, or a Roman Catholic directory.
• ordovician

  adjectivenounC2
  /ˌɔː.dəʊˈvɪʃ.ən/Relating to the geological period from about 485 to 443 million years ago, between the Cambrian and Silurian periods.
• ordure

  nounVery low
  /ˈɔːdjʊə/Excrement, dung; literal waste matter from the bowels.
• ordzhonikidze

  nounVery Low
  /ɔːˌdʒɒnɪˈkɪdzeɪ/A proper noun referring to a surname, most notably associated with the Soviet revolutionary and politician Sergo Ordzhonikidze, and several places renamed in his honor during the Soviet era.
• ore

  nounB2
  /ɔː(r)/A naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.
• ore bridge

  nounLow
  /ɔː brɪdʒ/A bridge-shaped structure, typically in a blast furnace or metallurgical plant, over which raw materials like iron ore are transported for charging.
• ore dressing

  nounVery Low
  /ˈɔː ˌdresɪŋ/The process of separating valuable minerals from gangue (waste rock) to prepare ore for further processing.
• ore hearth

  nounVery Low / Niche
  /ɔː(r) hɑːθ/A type of furnace or forge historically used for smelting or refining metal ores, typically made from fire-resistant materials like stone.
• ore mountains

  plural-nounC2
  /ˈɔː ˌmaʊn.tɪnz/A proper noun referring specifically to the Erzgebirge mountain range in Central Europe, which forms a natural border between Germany and the Czech Republic, and is historically known for its rich mineral deposits, especially metal ores.
• ore tanker

  nounLow
  /ˈɔː ˌtæŋkə/A large ship specifically designed to transport dry bulk commodities, primarily metal ores.
• oread

  nounC2 (Very low frequency; literary/poetic/technical)
  /ˈɔːrɪad/A nymph of the mountains in Greek and Roman mythology.
• orebody

  nounC2/Advanced
  /ˈɔːbɒdi/A large, continuous mass of rock containing a high enough concentration of minerals to make mining economically viable.
• orebro

  nounVery Low
  /ˈɜːrəbrʊ/A city in central Sweden, capital of Örebro County.

Showing 1801–1820 of 3187 words.