English Words: U
23,789 words · Page 459 of 476
An intermediate in the catabolism of L-histidine, transformed in the liver by urocanate hydratase (or urocanase) into 4-imidazolone-5-propionic acid and subsequently to glutamic acid.
A pigment that causes the yellow color in urine. It is a breakdown product of the blood's haemoglobin and is removed by the kidneys.
A blue pigment sometimes observed in the urine in certain diseases, especially scarlet fever.
A purified form of follicle-stimulating hormone from the urine of postmenopausal women, important in the development of follicles by the ovaries.
A red-brown pigment sometimes found in urine samples, especially in cases of porphyrinuria.
A substance, apparently the same as indigo, occasionally found in the urine in degeneration of the kidneys. It is readily formed by oxidation or decomposition of indican.
A paired structure, in the larvae and/or pupae of certain coleopterans, which grows out of the tergum of the last body segment and projects beyond the tip.
Of or pertaining to one or more median and posterior elements in the hyoid arch of fishes.
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 459. 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.