English Words Starting With O

• otter hound

  nounC1/C2
  /ˈɒtə haʊnd/A large, rough-coated hunting dog originally bred for hunting otters.
• otter shell

  nounRare
  /ˈɒtə ʃɛl/The hard, protective outer covering of an otter clam, a type of marine bivalve mollusc found in coastal waters.
• otter shrew

  nounVery Low
  /ˈɒtə ʃruː/A small, semi-aquatic mammal native to Central Africa, resembling a shrew but with otter-like adaptations for swimming.
• otter trawl

  nounC2
  /ˈɒtə trɔːl/A large, bag-shaped fishing net dragged along the sea bottom to catch fish and other marine life, using otter boards (trawl doors) to keep its mouth open.
• otterbein

  nounVery Low
  /ˈɒtəbaɪn/A proper noun referring to a surname or institutions named after Philip William Otterbein, a German-American clergyman and co-founder of the United Brethren in Christ.
• otterburn

  nounVery Low
  /ˈɒtəbɜːn/A specific geographical place name, typically referring to a location named after the presence of otters and a stream.
• otterhound

  nounVery Low
  /ˈɒt.ə.haʊnd/A large, rough-coated breed of dog originally developed for hunting otters.
• otto

  nounC2
  /ˈɒtəʊ/An alternative spelling for 'attar', meaning a fragrant essential oil, especially from rose petals.
• otto cycle

  nounLow
  /ˈɒtəʊ ˌsaɪk(ə)l/A four-stroke internal combustion engine cycle consisting of intake, compression, power, and exhaust strokes.
• otto i

  nounC2
  /ˈɒtəʊ ðə ˈfɜːst/Otto I, also known as Otto the Great, was a medieval king of Germany and Holy Roman Emperor (936–973), known for consolidating imperial power and promoting the Ottonian Renaissance.
• otto ii

  nounC2
  /ˈɒtəʊ ðə ˈsɛkənd/Proper noun referring to Otto II, a 10th-century Holy Roman Emperor.
• otto iii

  nounC1/C2 - Very Low
  /ˈɒtəʊ ðə ˈθɜːd/A specific Holy Roman Emperor (980–1002) who ruled from 996 until his death, known for his ambitious but ultimately unsuccessful vision of reviving the Roman Empire with Christian unity.
• otto iv

  nounVery Low
  /ˈɒtəʊ ðə ˈfɔːθ/Proper noun referring to a specific Holy Roman Emperor (c. 1175 – 1218).
• ottoman

  adjectivenounB2
  /ˈɒtəmən/A piece of furniture, typically upholstered, used as a seat, footrest, or storage unit.
• ottoman empire

  nounC1
  /ˌɒtəmən ˈɛmpaɪə/A major historical state and caliphate that existed from the late 13th century to 1922, centered in modern-day Turkey, controlling vast territories in Southeast Europe, Western Asia, and North Africa.
• ottrelite

  nounExtremely Rare
  /ˈɒtrəlaɪt/A specific, obscure variety of the mineral chloritoid, a silicate mineral.
• ottumwa

  nounRare
  /əˈtʌmwə/A proper noun referring to a specific city in the U.S. state of Iowa.
• otway

  nounVery Low
  /ˈɒtweɪ/A proper noun, primarily a surname or place name. Most famously, Thomas Otway (1652–1685), an English Restoration dramatist.
• ou

  abbreviationnounvery_low
  /aʊ/A Scottish and Northern English exclamation or interjection expressing alarm, surprise, or emphasis.
• ouabain

  nounC2 (Proficient - Very Low Frequency / Technical)
  /ˈwɑːbeɪn/A toxic cardiac glycoside used historically in medicine and derived from certain African plants.

Showing 2341–2360 of 3187 words.