English Words Starting With R

• reactant

  nounC1/C2
  /riˈæk.tənt/A substance that takes part in and undergoes change during a chemical reaction.
• reaction

  nounC1
  /riˈæk.ʃən/A response to a stimulus or event, often an immediate feeling, thought, or action.
• reaction chamber

  nounC1
  /riˈækʃən ˌtʃeɪmbə(r)/A sealed container or vessel designed to hold and control a chemical or nuclear reaction.
• reaction engine

  nounLow
  /rɪˈækʃən ˈɛndʒɪn/A propulsion device that works by expelling matter rearward to generate thrust forward.
• reaction formation

  nounC2/Academic
  /riˈækʃn̩ fɔːˈmeɪʃn̩/A defense mechanism where a person unconsciously adopts the opposite feeling, impulse, or behavior to one they fear or find unacceptable.
• reaction time

  nounC1
  /riˈækʃən ˌtaɪm/The time interval between the presentation of a stimulus and the initiation of a motor response to that stimulus.
• reaction turbine

  nounC2
  /riˈækʃən ˈtɜːbaɪn/A type of turbine in which torque is produced primarily by the reaction of water or steam against curved blades as it changes direction, typically using both pressure energy and kinetic energy.
• reactionary

  adjectivenounC1
  /riˈækʃən(ə)ri/A person who is strongly opposed to social or political change or reform; someone who wants to return to a previous, often more traditional, state of society.
• reactivate

  verbverb-intransitiveverb-transitiveB2-C1 (Upper Intermediate to Advanced)
  /ˌriːˈæk.tɪ.veɪt/To make something active again; to start something working or operating again after a period of inactivity.
• reactive component

  nounC1
  /riˈæk.tɪv kəmˈpəʊ.nənt/A part or element of a system that responds to changes, stimuli, or inputs, rather than initiating action independently.
• reactive depression

  nounMedium-High
  /riˌæk.tɪv dɪˈpreʃ.ən/A form of depression directly triggered by a specific, identifiable stressful or traumatic life event, such as a loss, bereavement, or major life change.
• reactive schizophrenia

  nounC2
  /riˈæktɪv ˌskɪt.səˈfriː.ni.ə/A diagnostic category of schizophrenia believed to be triggered by a major stressful life event and characterized by sudden onset and a better prognosis.
• reactivity

  nounC1
  /ˌriː.ækˈtɪv.ə.ti/The quality or state of being reactive; the tendency to react chemically, emotionally, or in a responsive manner.
• reactor

  nounC1
  /riˈæk.tər/A device, structure, or apparatus in which a controlled nuclear chain reaction takes place, used for generating heat to produce electricity.
• reactor vessel

  nounVery low
  /riˈæk.tə ˌves.əl/The large, robust, sealed container that holds the nuclear reactor core and coolant in a nuclear power plant.
• read

  nounverbverb-intransitiveverb-transitiveA1 (verb, present tense); A1-B2 (verb forms, phrasal verbs, idioms)
  /riːd/ (present), /rɛd/ (past)To look at and understand the meaning of written or printed words or symbols.
• read in

  verbB2
  /ˌriːd ˈɪn/To interpret or attribute a meaning to something (e.g., a text, situation, or data) that is not explicitly stated or intended.
• read into

  verbB2
  /ˌriːd ˈɪn.tuː/To interpret or give a meaning to something that may not be intended or explicitly stated.
• read out

  nounverbB1
  /ˌriːd ˈaʊt/To speak written or printed words aloud so that others can hear them.
• read up

  verbB2
  /ˌriːd ˈʌp/To study or learn about a subject in detail, especially by reading.

Showing 1161–1180 of 5802 words.