English Words: R
21,470 words · Page 19 of 430
A person who operates a radio transceiver, especially when a title or position in a crew.
A low-power radio transmitter that supplies positioning information to landing aircraft
Any of several alloys, mostly of nickel and iron, that have a high magnetic permeability
The branch of science that deals with the detection and measurement of radiant electromagnetic energy.
The radius modulus of an extra dimension in a compactification. Coined in 1998 by Nima Arkani-Hamed, Savas Dimopoulos, and John March-Russell in the paper "Stabilization of Sub-Millimeter Dimensions: The New Guise of the Hierarchy Problem".
Radio navigation; navigation using radio signals to provide positional information.
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 19. 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.