English Words: U
23,789 words · Page 3 of 476
A final statement of terms or conditions made by one party to another, especially one that expresses a threat of reprisal or war if the terms are not met before some specified date and time.
A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook.
Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales.
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.
Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
The use of ultrasound to produce images of the hidden interior of objects or spaces.
Sound with a frequency greater than the upper limit of human hearing, which is approximately 20 kilohertz.
Unnecessary, unprovoked (usually brutal) violence; violent acts simply for the thrill and entertainment of it.
Of electromagnetic radiation beyond (higher in frequency than) light visible to the human eye; radiation with wavelengths from 380 to 10 nanometres.
One of the five basic tastes, the savory taste of foods such as seaweed, cured fish, aged cheeses and meats.
Of or relating to the Umayyad dynasty, which ruled the Umayyad Caliphate from Damascus between 661 and 744 then from Harran until 750, and al-Andalus between 756 and 1031.
An assimilatory process whereby a vowel is pronounced more like a following vocoid that is separated by one or more consonants.
Acronym of United Malays National Organisation (“a Malay conservative political party in Malaysia”).
An umbrella group of several distinct tribal entities of Native Americans of the Umpqua Basin in present-day south central Oregon, United States.
Ted Kaczynski, the perpetrator of mail bomb attacks in America between 1978 and 1994, so named by the media.
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 3. 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.