English Words Starting With R

• rock wall

  nounB1
  /ˈrɒk ˌwɔːl/A vertical or near-vertical surface of natural rock, often forming a cliff or the side of a mountain.
• rock wallaby

  nounLow
  /ˈrɒk ˈwɒləbi/A small to medium-sized macropod (kangaroo family) adapted to rocky, often cliffside, habitats in Australia.
• rock wool

  nounLow to Medium
  /ˌrɒk ˈwʊl/A fibrous material made by spinning or drawing molten minerals (such as basalt or slag) into wool-like strands, used primarily for insulation and soundproofing.
• rock wren

  nounLow
  /ˈrɒk ˌren/A small, brownish songbird that inhabits rocky areas and builds nests in crevices.
• rock'n'roll

  nounB2
  /ˌrɒk ən ˈrəʊl/A genre of popular music that originated in the United States in the late 1940s and early 1950s, characterised by a strong beat, simple melodies, and often amplified instruments.
• rock-eel

  nounRare
  /ˈrɒk iːl/A marine fish of the family Pholidae, resembling an eel, that lives among rocks in cold coastal waters.
• rock-fill dam

  nounC1
  /ˈrɒk fɪl ˈdæm/A type of dam constructed primarily by dumping and compacting a large volume of rock or coarse, fragmented material.
• rock-shelter

  nounLow
  /ˈrɒk ˌʃɛltə/A natural formation where an overhanging rock provides a sheltered area beneath it.
• rockabilly

  nounLow
  /ˌrɒkəˈbɪli/A music genre that blends rock and roll with country and blues elements, originating in the 1950s United States.
• rockall

  nounVery Low
  /ˈrɒk.ɔːl/A small, uninhabited, remote rocky islet in the North Atlantic Ocean, claimed by the United Kingdom.
• rockaway

  nounLow
  /ˈrɒkəweɪ/A light, low-slung, four-wheeled horse-drawn carriage with a fixed top and open sides, often with a single seat for two passengers.
• rockefeller

  nounC1+
  /ˈrɒk.ɪ.fel.ər/A prominent American family of industrialists, bankers, and philanthropists, most notably John D. Rockefeller Sr., founder of Standard Oil.
• rocker

  nounB2
  /ˈrɒk.ər/A curved piece of wood or metal on which an object, typically a chair, can rock back and forth.
• rocker arm

  nounLow (C2/Proficient)
  /ˈrɒkər ɑːm/A pivoted lever in an internal combustion engine that transfers motion from a cam lobe to open and close a valve.
• rocker cam

  nounC1
  /ˈrɒk.ə kæm/A mechanical component within an engine's valve train that converts the rotating motion of the camshaft into a rocking motion to open and close the engine valves.
• rocker panel

  nounC1
  /ˈrɒkə ˌpæn(ə)l/The reinforced panel running along the lower side of a vehicle's body, between the front and rear wheel arches.
• rockery

  nounLow
  /ˈrɒkəri/A garden feature consisting of an arrangement of rocks with plants, often simulating a natural rocky landscape.
• rocket

  nounverbverb-intransitiveverb-transitiveB1
  /ˈrɒk.ɪt/A cylindrical projectile or vehicle, typically powered by engines that work by expelling exhaust gases, designed to travel at high speed through the air or into space.
• rocket airplane

  nounC2
  /ˈrɒk.ɪt ˈeə.rə.pleɪn/An experimental aircraft powered by a rocket engine.
• rocket bomb

  nounLow
  /ˈrɒkɪt bɒm/A bomb that is propelled to its target by a rocket engine.

Showing 4401–4420 of 5802 words.