English Words: R
21,470 words · Page 15 of 430
Any chromatograph in which the separated components are detected by their radioactivity.
Any form of chromatography in which the separated zones are detected by their radioactivity
A technique in which the absolute age of an artefact is determined by measuring the ratios of specific radioactive isotopes
An X-ray machine with a camera, able to record moving pictures of the internal organs.
An electronic device that was supposed to cure disease, operating based on tables of frequencies.
A collar, fitted with a small radio transmitter, that allows the wearer to be tracked
An increase in electric conduction induced by radio waves, exploited in the coherer.
A substance or device that has its conductivity altered in some way by electric waves, such as a coherer
Designating any medical contrast medium used to improve the visibility of internal bodily structures in X-ray imaging techniques such as computed tomography and radiography.
An organization or system of government continuously listening to ideology or instructions from the leader on the radio.
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 15. 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.