English Words: R
21,470 words · Page 40 of 430
A squid-like cephalopod of species Spirula spirula, the only extant member of its taxonomic order, found in the deep ocean.
jjapaguri/chapaguri; a dish made from the combination of two Korean instant noodle brands.
A diagram that visualizes the energetically allowed regions for backbone dihedral angles ψ against φ of amino acid residues in protein structure.
The holy ninth month of the Islamic lunar calendar, during which Muslims fast between the break of dawn until sunset; they also refrain from drinking liquids, smoking and having sexual relations.
An expression used during Ramadan to wish someone a happy time during the holiday.
the inelastic scattering of photons with subsequent change in frequency and phase; employed in Raman spectroscopy
A laser in which the fundamental light-amplification mechanism is stimulated Raman scattering.
The differential Raman scattering of left and right circularly polarized light by chiral molecules.
A form of spectroscopy that uses the Raman effect to study low-frequency vibrational and rotational modes of molecules.
A conjecture stating that the Ramanujan tau function given by the Fourier coefficients τ(n) of the cusp form Δ(z) of weight 12 Δ(z)=∑_(n>0)τ(n)qⁿ=q∏_(n>0)(1-qⁿ)²⁴=q-24q²+252q³-1472q⁴+4830q⁵-⋯, where q=e^(2πiz), satisfies |τ(p)|≤2p^(11/2), when p is a prime number.
A regular graph whose spectral gap is almost as large as possible, making it an excellent spectral expander. Such graphs are relevant to diverse branches of pure mathematics.
A technique for assigning a value to an infinite divergent series, not summation in the traditional sense, but having useful mathematical properties.
A theta function that generalizes the form of the Jacobi theta functions while capturing their general properties. It is defined as: f(a,b)=∑_(n=-∞) ᪲a^( frac )n(n+1)2;b^( frac )n(n-1)2 for |ab| < 1.
The transcendental number e^(π√), an almost integer, discovered in 1859 by mathematician Charles Hermite.
A generalization of the Ramanujan conjecture to other modular forms or automorphic forms.
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 40. 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.