English Words: R
21,470 words · Page 297 of 430
A light-sensitive pigment in the rod cells of the retina; it consists of an opsin protein bound to the carotenoid retinal
A deciduous flowering shrub of species Rhododendron canadense, native to northeastern North America.
A tetragonal-dipyramidal reddish gray mineral containing copper, iron, sulfur, and tin.
A hindbrain malformation characterised by vermian agenesis and fusion of the cerebellar hemispheres.
A convex polyhedron that has 12 congruent rhombic faces, 24 edges and 14 vertices of two types (eight 3-edge and six 4-edge) and is a Catalan solid.
A convex polyhedron that has 30 congruent rhombic faces, 60 edges and 32 vertices of two types (twenty 3-edge and twelve 5-edge) and is the Catalan solid dual to the icosidodecahedron.
A certain characteristic of a symmetric second-rank tensor in three-dimensional Euclidean space, describing its directional asymmetry.
An Archimedean solid with 62 regular faces (20 triangles, 30 squares, and 12 pentagons), 60 vertices and 120 edges.
An Archimedean solid with eight triangular and eighteen square faces; the small rhombicuboctahedron.
A nonconvex uniform polyhedron with square faces and sharing symmetry of a dodecahedron.
The ligament that joins the sternal end of the clavicle with the cartilage of the first rib.
A temporarily divided segment of the developing neural tube, within the hindbrain region
A musical instrument used in ancient mystical ceremonies, whirled to producing a roaring sound.
Any of the phylum Rhombozoa of tiny parasites found in the renal appendages of cephalopods.
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 297. 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.