Yellow or orange-yellow water-soluble compound, a member of the vitamin B complex, that acts as a growth-promoting factor in humans and other animals.

ribofuranosenoun

The furanose form of ribose

ribofuranosidenoun

Any glycoside derived from ribofuranose.

ribofuranosylnoun

A univalent radical derived from a ribofuranose

ribogenesisnoun

The biogenesis of RNA

ribohomopolymernoun

A homopolymer of a ribonucleoside

ribollitanoun

A traditional Tuscan soup made from reboiled vegetables, with a base of black cabbage and cannellini beans, and the addition of stale bread.

ribolyzationnoun

homogenization in a ribolyser

ribonuclearadj

Of, pertaining to, or produced by RNA.

ribonucleasenoun

Any of a group of enzymes that catalyze the hydrolysis of ribonucleic acid.

ribonucleasicadj

Relating to a ribonuclease

ribonucleatenoun

A strand of ribonucleic acid.

ribonucleicadj

Of or pertaining to ribonucleic acid (RNA) or its derivatives

ribonucleolyticallyadv

In a ribonucleolytic manner

ribonucleoparticlenoun

A complex formed from a ribosome and a ribonucleoprotein.

ribonucleoproteinnoun

Any nucleoprotein that contains RNA.

ribonucleoproteomenoun

A proteome of ribonucleoproteins

ribonucleosidenoun

Any nucleoside component of RNA.

ribonucleosomenoun

A nucleosome formed from RNA

ribonucleotidenoun

Any nucleotide having ribose as its sugar

ribooligonucleotidenoun

Any oligonucleotide derived from RNA

Spelling & Dictionary Insight

The English alphabetical index for the letter R contains 21,470 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 430 pages, and you are currently viewing page 303. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "R" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.