English Words: U
23,789 words · Page 453 of 476
A pre-reflective, original belief; a foundational doxic attitude prior to doubt or affirmation.
Modern Standard Urdu, an Indo-Aryan language with native speakers mainly in Pakistan and North India. It is a standardized and Persianized version of Hindustani.
The process of adopting or integrating elements of the Urdu language into another language or region.
A water-soluble organic compound, CO(NH₂)₂, formed by the metabolism of proteins and excreted in the urine.
An apparatus for measuring the amount of urea in urine, based on the amount of nitrogen produced in certain reactions.
the enzyme, found in soil bacteria and some plants, that catalyzes the hydrolysis of urea into ammonia and carbon dioxide
A glucoside extracted from the leaves of a plant, Pentalinon luteum, found in the Caribbean
Any compound, of general formula R-CO-NH-CO-NH₂ or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of urea.
Any of a class of penicillin antibiotics in which an amino group has been replaced by a urea moiety.
An achondrite composed mostly of olivine and clinobronzite with some diamond or graphite.
Any of various hydrolase enzymes involved in arginine/agmatine metabolism, the urea cycle, histidine degradation, and other pathways.
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 453. 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.