English Words Starting With R

• rotor

  nounB2
  /ˈrəʊ.tər/The rotating part of a machine or system, especially the central rotating assembly of an engine, turbine, or electric motor.
• rotor blade

  nounC1
  /ˈrəʊ.tə ˌbleɪd/A long, flat airfoil attached to a rotor hub, which rotates to generate lift and thrust for a helicopter, autogyro, or similar rotary-wing aircraft.
• rotor cloud

  nounC1/C2
  /ˈrəʊ.tə ˌklaʊd/A stationary lens-shaped cloud that forms on the lee (downwind) side of a mountain ridge or peak in strong, turbulent wind conditions.
• rotorcraft

  nounC1/C2
  /ˈrəʊ.tə.krɑːft/An aircraft that generates lift through one or more powered rotors.
• rotorua

  nounRare
  /ˌrɒt.ə.ˈruː.ə/A city on New Zealand's North Island known for its geothermal activity, Māori culture, and tourism.
• rotoscope

  nounverbverb-transitiveLow/Very Low
  /ˈrəʊ.tə.skəʊp/A film and animation technique where animators trace over live-action footage frame by frame.
• rotoscoping

  nounLow
  /ˈrəʊ.təˌskəʊ.pɪŋ/The animation technique where animators trace over live-action film movement, frame by frame, to create realistic motion.
• rototill

  verb-intransitiveverb-transitiveLow
  /ˈrəʊ.təʊˌtɪl/To till or plough soil using a rotary tiller (rototiller), a machine with rotating blades that breaks up the ground.
• rototiller

  nounLow
  /ˈrəʊ.təʊˌtɪl.ə/A motorized garden tool with rotating blades or tines used to break up and turn over soil.
• rotovate

  verbLow (Technical/Specialist)
  /ˈrəʊ.tə.veɪt/To break up and turn over soil using a Rotavator (rotary tiller).
• rotten borough

  nounLow (C2)
  /ˌrɒtən ˈbʌrə/A parliamentary borough in pre-1832 Britain that had very few voters but still sent MPs to Parliament, allowing local patrons to control the seat.
• rotten ice

  nounLow
  /ˈrɒt.ən aɪs/Sea ice or lake ice that has become honeycombed or structurally unsound due to melting or decay, often appearing dark and porous.
• rottenstone

  nounVery low (archaic/technical term)
  /ˈrɒt.ən.stəʊn/A soft, decomposed, siliceous limestone, used in powdered form as a fine abrasive for polishing wood, metal, or stone.
• rotter

  nounLow (archaic/dated)
  /ˈrɒtə(r)/A thoroughly unpleasant, contemptible, or dishonest person.
• rotterdam

  nounC2
  /ˌrɒtə(r)ˈdæm/The second-largest city in the Netherlands, a major port and economic centre.
• rottie

  nounLow/Medium (common in informal contexts among dog enthusiasts, rare in formal or general writing)
  /ˈrɒt.i/Informal or affectionate shortening of the dog breed name 'Rottweiler'.
• rottweiler

  nounB2
  /ˈrɒtvaɪlə/A powerful, large breed of dog of German origin, known for its black coat with distinctive tan markings, historically used as a cattle-herding and guarding dog.
• rotunda

  nounC1-C2 / Low Frequency
  /rəʊˈtʌndə/A round building, hall, or room, often one with a dome, such as the Capitol Rotunda in Washington D.C.
• rotundity

  nounLow
  /rə(ʊ)ˈtʌndəti/The quality or state of being rounded, plump, or spherical.
• roturier

  nounVery Low
  /ˈrɒtʃʊrɪeɪ/A person of humble or non-noble birth; a commoner.

Showing 5081–5100 of 5802 words.