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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)

reflate
verbverb-intransitiveverb-transitiveC1/C2
/ˌriːˈfleɪt/To deliberately stimulate an economy by increasing the money supply or government spending, often after a period of deflation or contraction.
reflation
nounLow to Medium (Specialist/Economic)
/ˌriːˈfleɪʃ(ə)n/A deliberate economic policy aimed at stimulating an economy by increasing the money supply or reducing taxes, typically to boost demand and lift price levels out of a deflationary state.
reflect
verbverb-intransitiveverb-transitiveB2
/rɪˈflɛkt/To throw back (light, heat, or sound) from a surface; to show or be a sign of (a quality or characteristic).
reflectance
nounC1/C2
/rɪˈflɛk.təns/The measure of the proportion of light or other radiation striking a surface which is reflected from it.
reflected plan
nounC1
/rɪˈflektɪd plæn/A plan or strategy that has been carefully considered, revised, or adjusted after thought or feedback; a deliberate course of action developed through contemplation.
reflecting
adjectivenounB2
/rɪˈflektɪŋ/The act of throwing back light, sound, or heat; or thinking deeply about something.
reflecting telescope
nounLow
/rɪˈflɛktɪŋ ˈtɛlɪskəʊp/A telescope that uses a curved mirror to gather and focus light, rather than lenses.
reflection
nounB2
/rɪˈflekʃn/The act or process of throwing back light, heat, or sound from a surface; the image produced; serious and careful thought.
reflection density
nounC2 (Specialist/Technical)
/rɪˈflɛkʃən ˈdɛnsɪti/A technical term in photography, reprography, and imaging that quantifies the darkness or opacity of a photographic image or print, as measured by its ability to reflect light.
reflection nebula
nounVery Low
/rɪˈflɛkʃən ˈnɛbjʊlə/A cloud of interstellar dust and gas that does not emit its own light but shines by reflecting the light from nearby stars.
reflection plane
nounTechnical/Low-Frequency
/rɪˈflɛkʃən pleɪn/An imaginary plane that divides a crystal, molecule, or symmetrical object into two halves that are mirror images of each other.
reflectivity
nounC1
/ˌrɪflekˈtɪvəti/The quality or state of reflecting light, sound, heat, or thought.
reflectometer
nounVery Low (C2+ technical term)
/ˌrɪflekˈtɒmɪtə/An instrument for measuring the reflectance or reflectivity of a surface or material.
reflector
nounB2
/rɪˈflɛktə/A surface or device that reflects light, sound, heat, or other waves back towards their source or in a specific direction.
reflectorize
verb-transitiveVery Low
/rɪˈflɛktəraɪz/To treat or coat a surface so that it reflects light, especially for increased visibility and safety.
reflet
nounLow
/rəˈfleɪ/A reflection of light or colour; a lustrous or iridescent appearance on a surface.
reflex
adjectivenounverb+1B2
/ˈriːfleks/An automatic, involuntary response to a stimulus.
reflex angle
nounC1/C2
/ˌriːfleks ˈæŋɡl/An angle greater than 180° and less than 360°.
reflex arc
nounC2
/ˈriːflɛks ɑːk/The basic physiological pathway of a reflex, involving sensory input, neural processing in the spinal cord or brain stem, and immediate motor output without conscious thought.
reflex camera
nounC1
/ˈriːfleks ˌkæm(ə)rə/A camera that uses a mirror system to allow the photographer to view through the same lens that will take the picture, providing a through-the-lens (TTL) viewfinder.

Showing 1981–2000 of 5802 words.