English Words: R
21,470 words · Page 428 of 430
Any atom which has a single valence electron in a shell well outside any other electrons in the aton; approximates the hydrogen atom.
A formula used in atomic physics to describe the wavelengths of spectral lines of many chemical elements.
A molecule, especially one consisting of two atoms of the same element, that has a permanent dipole because one of the atoms is in a very high excited state.
A town and civil parish with a town council on the northeast coast of the Isle of Wight, England.
A grain used extensively in Europe for making bread, beer, and (now generally) for animal fodder.
The larva of a fly, Chlorops pumilionis, an agricultural pest which feeds on stems of several species of grain and other grasses.
A former local government district in North Yorkshire, England, formed in April 1974, and abolished without replacement in April 2023.
The paradoxical situation whereby, if one accepts the cognitivist theory that every action is preceded by a thought, each thought must also be preceded by another thought, and so thinking could apparently never begin.
A piece of iron crossing the hole in the upper millstone, by which the stone is supported on the spindle.
An orthorhombic-dipyramidal mineral containing calcium, niobium, oxygen, and tantalum.
A Japanese style of aquarium aquascaping that focuses on wood being the main hardscape material; (countable) an aquascape in this style.
A conjecture within holography that posits a quantitative relationship between the entanglement entropy of a conformal field theory and the geometry of an associated anti-de Sitter spacetime.
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 428. 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.