English Words: U
23,789 words · Page 19 of 476
Providing an extremely high degree of luxury, well beyond what "luxury" would normally imply
Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.
A running race over a distance longer than 42.195 km (26 miles 385 yard), the length of a standard marathon.
The process of metamorphism at extreme temperatures and pressures where rocks are partially heated to magma, to which the affected rocks then become metamorphic after fusing.
A form of metamorphosis that occurs at a temperature and pressure just below the fusion point of the rock
Describing a metric whose triangle inequality has the stronger form d(x,z)< max d(x,y),d(y,z).
A bacterium that is considerably smaller than typical bacterial cells and is 0.2 to 0.3 micrometers (200-300 nm) in diameter.
A particularly compact microfiche, storing data at significantly higher densities.
Spelling & Dictionary Insight
The English alphabetical index for the letter U contains 23,789 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 476 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 "U" 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.