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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)

reˈstrainer
nounC2
/rɪˈstreɪnə(r)/A person or thing that restrains; one who holds back or controls.
reˈsusciˌtator
nounC2
/rɪˈsʌsɪteɪtə/A person or device that restores someone to consciousness or life.
reˈtraction
nounC1
/rɪˈtræk.ʃən/The action of withdrawing a statement, accusation, or promise because it was incorrect or invalid.
reˈtrenchment
nounC1/C2
/rɪˈtrɛn(t)ʃm(ə)nt/The action of reducing costs or spending; a reduction in extent or quantity.
reˈverbeˌrator
nounVery Low / Technical
/rɪˈvɜː.bə.reɪ.tə(r)/A device or surface that causes sound waves to echo or be reflected repeatedly.
reˈvivalist
adjectivenounC1
/rɪˈvaɪvəlɪst/A person who seeks to revive or promote something, especially a preacher who conducts religious revivals.
reˌdinteˈgration
nounC1
/ˌriːˌɪntɪˈɡreɪʃn/The process of restoring someone or something to a unified or functional whole.
reˌduplication
nounC2
/ˌriː.dʒuː.plɪˈkeɪ.ʃən/The action or process of repeating something exactly or with a slight change; specifically, in linguistics, a morphological process where all or part of a word is repeated.
reˌgeneˈration
nounC1
/rɪˌdʒɛnəˈreɪʃən/The process of being renewed, restored, or grown again.
rflp
abbreviationnounTechnical
/ˌɑːr ɛf ɛl ˈpiː/A genetic analysis technique that identifies variations in DNA sequences.
rh disease
nounLow
/ˌɑːrˈeɪtʃ dɪˌziːz/A severe hemolytic disease affecting newborns, caused by blood type incompatibility between mother and fetus.
rh factor
nounLow
/ˌɑːr ˈeɪtʃ ˌfæk.tər/An inherited antigen (protein) found on the surface of red blood cells, which determines whether a person's blood type is Rh positive or Rh negative.
rh negative
adjectivenounC1
/ˌɑːr eɪtʃ ˈneɡ.ə.tɪv/A blood classification indicating the absence of the Rhesus (Rh) factor antigen on the surface of red blood cells.
rh positive
adjectivenounLow-Frequency (Medical/Term of Art)
/ˌɑːr eɪtʃ ˈpɒz.ə.tɪv/Having the Rh factor, a specific protein (D antigen), present on the surface of red blood cells.
rhabdocoele
nounExtremely Rare
/ˈrabdə(ʊ)ˌsiːl/A type of simple, ciliated flatworm belonging to the class Rhabditophora, characterized by having a sac-like intestine.
rhabdom
nounC2
/ˈrabdəm/A rod-like structure in the compound eye of an arthropod (such as an insect or crustacean) that transmits light to the photoreceptor cells.
rhabdomancy
nounLow
/ˈræb.dəʊˌmæn.si/Divination by means of rods or wands, especially to locate underground water, minerals, or other hidden substances.
rhabdomyoma
nounVery Rare
/ˌræbdə(ʊ)maɪˈəʊmə/A rare, benign tumour arising from striated muscle cells.
rhabdomyosarcoma
nounVery Low
/ˌrabdə(ʊ)ˌmʌɪə(ʊ)sɑːˈkəʊmə/A rare, malignant (cancerous) tumor arising from immature skeletal muscle cells.
rhabdovirus
nounVery Low
/ˈrabdə(ʊ)ˌvʌɪrəs/Any of a family of RNA viruses with a bullet-shaped or rod-like morphology, which includes pathogens affecting animals, plants, and humans.

Showing 3421–3440 of 5802 words.