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1U adjective : characteristic of the upper classes

2U abbreviation 1 [ORIGIN abbr. of Union of Orthodox Hebrew Congregations] kosher certification — often enclosed in a circle

2 university

3 unsatisfactory

3U symbol uranium

UAE abbreviation United Arab Emirates

UAR abbreviation United Arab Republic

UAW abbreviation United Automobile Workers

ubiq·ui·tous adjective : existing or being everywhere at the same time : constantly encountered

— ubiq·ui·tous·ly adverb

— ubiq·ui·ty noun

U–boat noun [ORIGIN: trans. of G U-boot, short for Unterseeboot, lit., undersea boat]

: a German submarine

UC abbreviation uppercase

ud·der noun : an organ (as of a cow) consisting of two or more milk glands enclosed in a large hanging sac and each provided with a nipple

UFO noun, plural UFO's or UFOs : an unidentified flying object; especially : FLYING SAUCER

Ugan·dan noun : a native or inhabitant of Uganda

— Ugandan adjective

ug·ly adjective ug·li·er; -est [ORIGIN: ME, fr. ON uggligr, fr. uggr fear]

1 : FRIGHTFUL, DIRE

2 : offensive to the sight : HIDEOUS

3 : offensive or unpleasant to any sense

4 : morally objectionable : REPULSIVE

5 : likely to cause inconvenience or discomfort

6 : SURLY, QUARRELSOME

— ug·li·ness noun

Synonyms

grotesque, hideous, unappealing, unattractive, unlovely, unsightly, vile; also disgusting, repugnant, repulsive, revolting; unimposing, unprepossessing, unimpressive; plain, unaesthetic, unbecoming, unshapely

Antonyms

attractive, beauteous, beautiful, comely, cute, fair, gorgeous, handsome, lovely, pretty, stunning, taking

UHF abbreviation ultrahigh frequency

UK abbreviation United Kingdom

ukase noun [ORIGIN: F & Russ; F, fr. Russ ukaz, fr. ukazat' to show, order]

: an edict esp. of a Russian emperor or government

Ukrai·ni·an noun : a native or inhabitant of Ukraine

— Ukrainian adjective

uku·le·le also uke·le·le noun [ORIGIN: Hawaiian ukulele, fr. uku flea + lele jumping]

: a small usu. 4-stringed guitar popularized in Hawaii

ul·cer noun 1 : an open eroded sore of skin or mucous membrane often discharging pus

2 : something that festers and corrupts like an open sore

— ul·cer·ous adjective

ul·cer·ate verb -at·ed; -at·ing : to become affected with an ulcer

— ul·cer·a·tive adjective

ul·cer·a·tion noun 1 : the process of forming or state of having an ulcer

2 : ULCER 1

ul·na noun : the bone on the little-finger side of the human forearm; also : a corresponding bone of the forelimb of vertebrates above fishes

ul·ster noun : a long loose overcoat

ult abbreviation 1 ultimate

2 ultimo

ul·te·ri·or adjective 1 : lying farther away : more remote

2 : situated beyond or on the farther side

3 : going beyond what is openly said or shown : HIDDEN <~ motives>

1ultimate adjective 1 : most remote in space or time : FARTHEST

2 : last in a progression : FINAL

3 : the best or most extreme of its kind

4 : arrived at as the last resort

5 : FUNDAMENTAL, ABSOLUTE, SUPREME <~ reality>

6 : incapable of further analysis or division : ELEMENTAL

7 : MAXIMUM

Synonyms

[2] final, hindmost, last, latter, terminal—more at LAST

[3] consummate, maximum, most, nth, paramount, supreme, top, utmost; also unequaled, unmatched, unparalleled, unrivaled, unsurpassed; topmost, upmost, uppermost

Antonyms

least, minimal, minimum

2ultimate noun : something ultimate

ul·ti·mate·ly adverb : at an unspecified later time : in the end

Synonyms

eventually, someday, sometime, yet—more at YET

ul·ti·ma·tum noun, plural -tums or -ta : a final condition or demand whose rejection will bring about a resort to forceful action

ul·ti·mo adjective [ORIGIN: L ultimo mense in the last month]

: of or occurring in the month preceding the present

1ultra adjective : going beyond others or beyond due limits : EXTREME

Synonyms

extreme, extremist, fanatic, rabid, radical, revolutionary—more at EXTREME

2ultra noun : EXTREMIST

ul·tra·con·ser