English Words: R
21,470 words · Page 256 of 430
The thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
A translucent variety of serpentine of a honey-yellow to greenish-yellow colour, with a waxy resinous lustre.
Either of two carotenoid pigments found in the retina and produced from vitamin A; retinal
Part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate, hypothetical membrane resembling the retina.
A malignant tumour of the retina; a hereditary condition found mostly in children.
Any of a class of photosensitive pigment, related to rhodopsin, located primarily in the inner portions of the visual cells of cephalopods
Of or pertaining to the retina and the hypothalamus; used especially of the retinohypothalamic tract, a photic input pathway involved in the circadian rhythms of mammals.
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 256. 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.