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English Words Starting With R

5,802 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

reforming
nounB2
/rɪˈfɔːmɪŋ/The process of making changes to something in order to improve it, especially an institution, law, or system.
reformism
nounC1
/rɪˈfɔːmɪzəm/The political doctrine of achieving social change through gradual, progressive reforms within existing systems, rather than through revolutionary overthrow.
reformist
adjectivenounC1
/rɪˈfɔː.mɪst/A person who advocates for gradual political or social change within an existing system.
reformulate
verbverb-transitiveC1-C2 / Low Frequency / Academic & Technical
/ˌriːˈfɔː.mjʊ.leɪt/to express or state something again, but in a different way, to make it clearer or more suitable.
refract
verbverb-transitiveC1
/rɪˈfrækt/To bend or change the direction of light, sound, or other waves as they pass from one medium into another.
refracting telescope
nounC1/C2
/rɪˈfræktɪŋ ˈtelɪskəʊp/A telescope that uses a glass lens as its main component (the objective lens) to gather and bend (refract) light to form an image.
refraction
nounC1
/rɪˈfræk.ʃən/The bending of light, sound, or other waves as they pass from one medium into another.
refractive index
nounC2
/rɪˌfræk.tɪv ˈɪn.deks/The ratio of the speed of light in a vacuum to its speed in a given medium, indicating how much light bends when entering that material.
refractivity
nounC1/C2
/ˌriːfrækˈtɪvɪti/The physical property of a medium that determines how much it slows down light passing through it; a measure of its ability to refract (bend) light.
refractometer
nounC2 (Very Low Frequency - Technical/Specialist)
/ˌriːfrækˈtɒmɪtə(r)/A scientific instrument that measures the refractive index of a substance, typically used to determine its purity, concentration, or identity.
refractor
nounLow
/rɪˈfræktə/A device or material that bends light or other electromagnetic radiation as it passes through, typically used in optics.
refractory
adjectivenounC2
/rɪˈfræk.tər.i/resistant to authority, control, or treatment; stubbornly unmanageable.
refractory period
nounC1/C2 (Advanced to Proficient)
/rɪˈfræk.tər.i ˈpɪə.ri.əd/A temporary physiological period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.
refrain
verbverb-intransitiveverb-transitiveB2
/rɪˈfreɪn/To stop oneself from doing something; to resist an impulse or desire
reframe
verbB2-C1
/ˌriːˈfreɪm/To frame or express (an idea, question, situation, etc.) in a different way, typically to present a more positive or productive perspective.
refreeze
verbC1
/ˌriːˈfriːz/To freeze again; to cause something that has thawed or melted to become solid ice or frozen once more.
refresco
nounB1
/rɪˈfrɛskəʊ/A cold, non-alcoholic drink, typically carbonated and sweetened.
refresh
verbverb-intransitiveverb-transitiveB1
/rɪˈfreʃ/To make someone or something feel less tired, hot, or stressed; to restore energy or vitality.
refresh rate
nounB2
/rɪˈfrɛʃ ˌreɪt/The frequency at which a display updates its image.
refreshen
verb-ambitransitiveLow
/rɪˈfrɛʃən/To make (something or someone) feel fresh, revived, or invigorated again.

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