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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)

ribera
nounLow
/rɪˈbeə.rə/A bank, shore, or riverside area; especially a fertile area by a river.
ribgrass
nounLow
/ˈrɪbɡrɑːs/A common weed with ribbed leaves, scientifically Plantago lanceolata, also known as ribwort or narrowleaf plantain.
riblet
nounLow frequency. Known mainly in culinary/butchery contexts.
/ˈrɪblɪt/A small, boneless piece of meat cut from the rib section, typically from pork or lamb.
riboflavin
nounlow
/ˌraɪ.bəʊˈfleɪ.vɪn/A vitamin of the B complex, essential for metabolic processes and energy production.
ribonuclease
nounLow
/ˌraɪbəʊˈnjuːklɪeɪz/An enzyme that catalyzes the breakdown of RNA into smaller components.
ribonucleic acid
nounC2
/ˌraɪ.bəʊ.njuːˌkleɪ.ɪk ˈæs.ɪd/A molecule present in all living cells, essential for coding, decoding, regulation, and expression of genes.
ribonucleoprotein
nounVery Low (C2+)
/ˌraɪbəʊˌnjuːklɪəʊˈprəʊtiːn/A complex or particle composed of ribonucleic acid (RNA) and protein.
ribonucleoside
nounVery Low
/ˌrʌɪbə(ʊ)ˈnjuːklɪə(ʊ)sʌɪd/A compound consisting of a ribose sugar molecule linked to a nitrogenous base (adenine, guanine, cytosine, or uracil) but without a phosphate group.
ribonucleotide
nounC1/C2
/ˌraɪbəʊˈnjuːklɪətaɪd/A nucleotide containing ribose as its pentose sugar, a basic building block of RNA.
ribose
nounC1
/ˈraɪbəʊz/A pentose sugar (C5H10O5) that is a component of RNA and various coenzymes.
riboso
nounExtremely Rare / Non-Standard
A creative blend word (ribosome + 'so'), often used humorously or mistakenly for 'ribosome' or in brand/character names. Not a standard English word.
ribosomal rna
nounC2
/ˌraɪbəˈsəʊməl ɑːr ɛn ˈeɪ/The specific type of RNA that forms the structural and catalytic core of a ribosome, the cellular machine that synthesizes proteins.
ribosome
nounC2/Technical
/ˈraɪ.bə.səʊm/A tiny cellular structure where proteins are synthesised according to genetic instructions.
ribozo
nounC2
/ˈraɪ.bə.zəʊ/A prefix in biotechnology and molecular biology denoting relation to ribosomes, ribozymes, or ribonucleic acid (RNA).
ribozyme
nounC1/C2
/ˈrʌɪbə(ʊ)zʌɪm/A molecule of RNA that functions as an enzyme, catalyzing chemical reactions within cells.
ribwort
nounLow
/ˈrɪb.wɜːt/A common, small perennial plant with long, narrow leaves that have prominent parallel veins (ribs), and a distinctive cylindrical flower head. Scientific name: Plantago lanceolata.
ricardian theory of rent
nounC2
/rɪˈkɑː.di.ən ˈθɪə.ri əv rent/An economic principle stating that the rent of land is determined by the difference in productivity between the most fertile and least fertile plots in use.
ricardo
nounLow
/rɪˈkɑː.dəʊ/A proper noun, primarily a male given name of Spanish and Portuguese origin, meaning 'powerful ruler' or 'brave ruler'.
riccati equation
nounVery Low
/rɪˈkɑːti ɪˌkweɪʒn/A specific type of nonlinear ordinary differential equation of a standard form.
ricci
nounLow
/ˈriːtʃi/A common Italian surname, meaning 'curly-haired'.

Showing 3661–3680 of 5802 words.