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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)

retinaculum
nounVery low
/ˌrɛtɪˈnakjʊləm/A band or structure that holds an organ or tissue in place; a ligament serving to connect and retain parts.
retinal rivalry
nounC2 / Very Low Frequency / Highly Specialized
/ˈretɪn(ə)l ˈraɪv(ə)lri/A perceptual phenomenon where two different images are presented one to each eye, resulting in the brain's inability to fuse them into a single, stable perception; instead, perception alternates between the two images.
retinene
nounRare
/ˈrɛtɪniːn/The light-absorbing molecule in the retina of the eye, also known as retinaldehyde.
retinite
nounC2 (Extremely low-frequency technical term)
/ˈrɛtɪnʌɪt/A type of fossil resin, specifically a hard, brownish or yellowish fossil resin similar to amber but from different botanical sources or with a different chemical composition.
retinitis
nounC2
/ˌret.ɪˈnaɪ.tɪs/An inflammation of the retina.
retinitis pigmentosa
nounRare/Technical
/ˌrɛtɪˈnaɪtɪs ˌpɪɡmɛnˈtəʊsə/A genetic eye disease causing progressive retinal degeneration and loss of vision.
retinoblastoma
nounvery low
/ˌrɛtɪnəʊblæsˈtəʊmə/A malignant tumour of the retina, occurring in young children.
retinoid
adjectivenounC2/Advanced
/ˈrɛtɪnɔɪd/Any of various natural or synthetic compounds related to or derived from vitamin A, affecting cell growth, differentiation, and epithelial tissue.
retinol
nounC1
/ˈrɛtɪnɒl/A form of vitamin A (retinyl ester) found in animal products, and a common ingredient in skincare products used to treat signs of ageing and acne.
retinopathy
nounC2
/ˌret.ɪˈnɒp.ə.θi/Any disease or disorder of the retina.
retinoscope
nounRare (C2+)
/ˈret.ɪ.nəˌskəʊp/An instrument used by optometrists and ophthalmologists to measure and assess the refractive error of the eye (e.g., nearsightedness, farsightedness) by observing the reflex from the retina.
retinoscopy
nounSpecialist
/ˌrɛtɪˈnɒskəpi/A diagnostic technique in optometry and ophthalmology for determining the refractive error of the eye, often by observing the movement of light reflected from the retina.
retinue
nounC1
/ˈret.ɪ.njuː/A group of people accompanying and serving an important person.
retinula
nounVery Low
/rɪˈtɪnjʊlə/A cluster of photoreceptor cells forming part of a single visual unit in the compound eye of an arthropod.
retiral
nounLow
/rɪˈtaɪərəl/The act of retiring from work or professional life.
retirant
nounVery Rare
/rɪˈtaɪə.rənt/A person who is retiring or has retired, especially from a profession or occupation.
retire
nounverbverb-intransitive+1High
/rɪˈtaɪə/To permanently leave one's job, usually upon reaching a certain age, and cease active working life.
retiree
nounC1
/rɪˌtaɪəˈriː/A person who has permanently stopped working, typically because of reaching the standard age for leaving employment.
retirement
adjectivenounB2
/rɪˈtʌɪəmənt/The act of leaving one's job and ceasing to work, typically after reaching a certain age or length of service, or the period of life after doing so.
retirement community
nounC1
/rɪˈtaɪəmənt kəˈmjuːnɪti/A planned residential community specifically designed for older adults, typically aged 55 and over.

Showing 3101–3120 of 5802 words.