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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)

retentionist
nounC2
/rɪˈtɛnʃ(ə)nɪst/A person who advocates keeping or retaining something, especially an existing law or institution.
retentivity
nounC2
/ˌriːtɛnˈtɪvɪti/The ability to retain or hold something; a measure of how strongly a material can be magnetized after the magnetizing force is removed.
retepore
nounExtremely Low (Technical/Latin)
/ˈriːtɪpɔː/A specific type of bryozoan (marine invertebrate) belonging to the genus Retepora, characterized by a lace-like or net-like calcareous colony structure.
retest
verbC1
/ˌriːˈtɛst/To test again; the act of testing something again.
rethink
nounverbverb-ambitransitiveC1
/ˌriːˈθɪŋk/To consider something again in order to potentially change your opinion, plan, or approach.
rethondes
nounVery Low
/ʁə.tɔ̃d/A proper noun, specifically a place name referring to a commune in the Oise department in northern France, historically known for the signing of the 1918 and 1940 Armistices.
reti
nounC2/Rare
/ˈriːtaɪ/The plural form of 'rete', meaning a network or mesh, used especially in anatomy, zoology, and scientific contexts to describe a net-like structure.
retiarius
nounVery low
/ˌriːtiˈɑːriəs/In ancient Rome, a type of gladiator who fought with a net (rete) and a trident or dagger.
reticence
nounC1
/ˈret.ɪ.səns/The quality of being reserved, restrained, or unwilling to communicate one's thoughts or feelings freely.
reticle
nounC2
/ˈrɛtɪk(ə)l/A network of fine lines or fibers in the eyepiece of an optical instrument, used as a measuring scale or for precise aiming.
reticular formation
nounC2
/rɪˌtɪkjʊlə fɔːˈmeɪʃən/A network of nerve pathways in the brainstem involved in consciousness, arousal, and sleep-wake cycles.
reticulate
adjectiveverbverb-intransitive+1C1/C2 (Low frequency, specialized)
/rɪˈtɪkjʊleɪt/To form, divide, or mark something into a network of fine lines resembling a net or having a net-like pattern.
reticulate python
nounC1
/rɪˈtɪk.jʊ.lət ˈpaɪ.θən/A large constricting snake (Morelia reticulata), native to Southeast Asia, recognized for its intricate, net-like pattern.
reticulated tracery
nounVery Low
/rɪˌtɪk.jʊ.leɪ.tɪd ˈtreɪ.sər.i/A type of Gothic window tracery consisting of a net-like pattern of interlacing stone bars forming a continuous design.
reticulation
nounC2 (Low frequency)
/rɪˌtɪk.jʊˈleɪ.ʃən/The process or state of forming or being formed into a net-like pattern or structure of interconnected lines.
reticule
nounVery Low
/ˈrɛt.ɪ.kjuːl/A small, typically decorative, women's handbag or pouch, historically made of netted fabric and often used in the 18th and 19th centuries.
reticulocyte
nounRare (C2)
/rɪˈtɪk.jə.lə(ʊ)ˌsʌɪt/An immature red blood cell that still contains a network of cytoplasmic RNA.
reticuloendothelial system
nounVery Low (C2+)
/rɪˌtɪkjʊləʊˌɛndəʊˈθiːliəl ˈsɪstəm/A part of the immune system comprising certain cells in tissues, primarily those that filter particles from the blood, such as macrophages.
reticulum
nounC2
/rɪˈtɪkjʊləm/A fine network or mesh-like structure.
retina
nounLow frequency in general conversation; medium frequency in medical/biological contexts.
/ˈret.ɪ.nə/The light-sensitive layer of tissue at the back of the inner eye, containing photoreceptor cells (rods and cones) that convert light into neural signals.

Showing 3081–3100 of 5802 words.