English Words: R
21,470 words · Page 21 of 430
the luminescence observed when some minerals or glasses, having been exposed to ionizing radiation, are subsequently exposed to ultraviolet light; exploited in some dosimeters
A small capsule containing a transmitter, introduced into the body for purposes of radiotelemetry.
Any form of protection against the harmful effects of ionizing radiation, especially caused by artificial sources.
A substance, such as potassium iodide, that provides some protection against the harmful effects of radiation.
The relative reactivity of cells or organisms to any form of radiation, but especially to the harmful effects of ionizing radiation
Any form of resistance that an organism has to protect itself against the harmful effects of ionizing radiation
A technique in which a substance radioactively labelled with 146C is introduced into a closed environment, and any radioactive carbon dioxide subsequently detected is used as evidence for the presence of life
The body's recovery/repair response, in the form of specific cytokines, to radiation damage
A scan for the presence of radioactive material in a sample; especially for a radioactive tracer in an organ
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 21. 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.