English Words: R
21,470 words · Page 384 of 430
Any of many minute aquatic multicellular organisms, of the phylum Rotifera, that have a ring of cilia resembling a wheel.
Alternative form of rottol: a former Middle Eastern and North African unit of weight, usually 1–5 pounds (0.5–2.5 kg).
A person who creates masks for frames, to crop in and out backgrounds and objects, frame-by-frame in video and film, for rotoscoping.
Describing the heating produced by various affects of the reduction in angular momentum of a rotating neutron star (especially a pulsar)
In which energy is continuously imparted to the pumped fluid by means of a rotating impeller, propeller, or rotor (unlike a positive displacement pump, in which a fluid is moved by trapping a fixed amount of fluid and forcing the trapped volume into the pump's discharge)
A turnstile with its height extended to the height of a person, similar to a revolving door.
A photograph printed by a process in which a strip or roll of sensitized paper is automatically fed over the negative so that a series of prints are made, and are then rapidly developed, fixed, cut apart, and washed.
A process that lines the interior of metal objects with a polymer that involves heating and rotating the item.
Any of a class of solutions to the n-body problem, in a curved space, whose configuration rotates during the motion.
A rotating part of a mechanical device; for example, in an electric motor, generator, alternator, or pump.
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 384. 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.