English Words: R
21,470 words · Page 268 of 430
A small rocket engine on a larger rocket or spacecraft, designed to slow or reverse its motion.
The technique of preparing a plot but leaving the actors to improvise their own dialogue.
A transitional period, occurring immediately before and after retrograde, during which a planet moves across the same part of the sky twice.
On the video game platform Roblox, messy or inauthentic attempts at retro avatar or game styles.
Derived from a simpler, regular polyhedron by the addition of extra triangular faces in the back.
A specific type of clinicoradiopathologic conference that was used in the early decades of radiography (circa 1900 until World War I), whereby practitioners would make a radiologic diagnosis and then systematically compare it with the subsequent clinical course and any surgery, intraoperative or postoperative radiography or fluoroscopy, and/or autopsy. This method helped advance radiology, given that it is inherently a field of discerning clinicoradiological and clinicoradiopathological correlations. It is no longer codified under this name, because it is no longer necessary in routine practice.
A hypothetical instrument that allows diagnostic and management decisions to be made with medical hindsight.
The prediction of precursors (intermediates and reactants), given the products of a synthesis reaction.
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 268. 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.