English Words Starting With R

• rotary hoe

  nounLow (Technical/Agricultural)
  /ˈrəʊ.tər.i həʊ/A farming implement with rotating blades or tines used to cultivate soil, break up clods, and control weeds.
• rotary plough

  nounLow
  /ˈrəʊtəri plaʊ/A farm implement, typically tractor-mounted, that uses rotating blades or tines to turn over and break up soil for cultivation.
• rotary plow

  nounLow
  /ˈrəʊtəri plaʊ/A farm implement with rotating blades or tines that breaks up and turns over soil.
• rotary press

  nounC2
  /ˈrəʊtəri prɛs/A printing press that uses a continuously rotating cylindrical surface to print on paper, widely used for high-volume printing like newspapers and magazines.
• rotary pump

  nounC1
  /ˈrəʊ.tər.i pʌmp/A mechanical pump that moves fluid using a rotating mechanism, typically featuring gears, vanes, lobes, or screws within a housing.
• rotary shutter

  nounLow
  /ˈrəʊ.tər.i ˈʃʌt.ər/A mechanical device with rotating blades or vanes used to control the admission of light, air, or fluid.
• rotary tiller

  nounLow
  /ˈrəʊt(ə)ri ˈtɪlə/A motorized gardening or farming machine with rotating blades (tines) that break up and aerate soil.
• rotary valve

  nounTechnical Low-Frequency
  /ˈrəʊ.tər.i vælv/A valve that regulates the flow of a fluid or gas by the rotation of a disc or cylinder with passages through it.
• rotary wing

  nounC1+ / Specialized Technical
  /ˈrəʊ.tər.i wɪŋ/A type of aircraft lift-generating system where wings (blades) rotate around a central mast, providing lift and propulsion through their rotation.
• rotary-till

  verb-ambitransitiveLow
  /ˈrəʊtəri tɪl/To cultivate soil using a machine with rotating blades, typically a rotary tiller.
• rotate

  adjectiveverbverb-intransitiveverb-transitiveB2
  /rəʊˈteɪt/to turn around a central point
• rotation

  nounB2
  /rəʊˈteɪʃ(ə)n/The action of rotating around an axis or centre; circular movement.
• rotation axis

  nounB2
  /rəʊˈteɪʃən ˈæksɪs/The imaginary line around which an object rotates or spins.
• rotation of axes

  nounC2
  /rəʊˈteɪ.ʃən əv ˈæk.siːz/A transformation in mathematics or physics where a coordinate system is rotated to a new orientation to simplify a problem or gain a different perspective.
• rotation-inversion axis

  nounC2
  /rəʊˈteɪʃən ɪnˈvɜːʃən ˈæksɪs/A symmetry operation in crystallography and molecular symmetry consisting of a rotation followed by an inversion through a point on the rotation axis.
• rotational molding

  nounC1
  /rəʊˌteɪ.ʃən.əl ˈməʊl.dɪŋ/A manufacturing process for creating hollow plastic parts by rotating a heated mold while plastic powder melts and coats the interior.
• rotational quantum number

  nounVery low (C2)
  /rəʊˌteɪ.ʃən.əl ˈkwɒn.təm ˌnʌm.bər/An integer quantum number (denoted J) characterizing the rotational energy levels of a molecule or nucleus.
• rotator

  nounLow
  /rəʊˈteɪtə/something that rotates or causes rotation
• rotator cuff

  nounC1/C2 (Technical/Medical contexts)
  /ˌrəʊˈteɪtə ˌkʌf/A group of muscles and tendons that stabilize the shoulder joint and enable its rotation.
• rotavator

  nounC1/C2
  /ˈrəʊ.tə.veɪ.tə(r)/A powered machine with rotating blades or tines for breaking up and tilling soil.

Showing 5041–5060 of 5802 words.