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ul·tra·high frequency noun : a radio frequency between 300 and 3000 megahertz

1ultralight adjective : extremely light esp. in weight

2ultralight noun : a very light recreational aircraft typically carrying only one person

ul·tra·ma·rine noun 1 : a deep blue pigment

2 : a very bright deep blue color

ul·tra·mi·cro·scop·ic adjective : too small to be seen with an ordinary microscope

ul·tra·mod·ern adjective : extremely or excessively modern in idea, style, or tendency

Synonyms

contemporary, current, hot, mod, modern, new, newfangled, red-hot, space-age, up-to-date—more at MODERN

ul·tra·mon·tane adjective 1 : of or relating to countries or peoples beyond the mountains (as the Alps)

2 : favoring greater or absolute supremacy of papal over national or diocesan authority in the Roman Catholic Church

— ultramontane noun, often cap

— ul·tra·mon·tan·ism noun

ul·tra·pure adjective : of the utmost purity

ul·tra·short adjective 1 : having a wavelength below 10 meters

2 : very short in duration

ul·tra·son·ic adjective : having a frequency too high to be heard by the human ear

— ul·tra·son·i·cal·ly adverb

ul·tra·son·ics noun singular or plural 1 : ultrasonic vibrations

2 : the science of ultrasonic phenomena

ul·tra·sound noun 1 : ultrasonic vibrations

2 : the diagnostic or therapeutic use of ultrasound and esp. a technique involving the formation of a two-dimensional image of internal body structures

3 : a diagnostic examination using ultrasound

ul·tra·vi·o·let adjective : having a wavelength shorter than those of visible light and longer than those of X-rays <~ radiation>; also : producing or employing ultraviolet radiation

— ultraviolet noun

ul·tra vi·res adverb or adjective [ORIGIN: NL, lit., beyond power]

: beyond the scope of legal power or authority

ul·u·late verb -lat·ed; -lat·ing : HOWL, WAIL

uma·mi noun [ORIGIN: Jp, flavor]

: a meaty or savory taste sensation produced esp. by monosodium glutamate

um·bel noun : a flat-topped or rounded flower cluster in which the individual flower stalks all arise near one point on the main stem

um·ber noun : a brown earthy substance valued as a pigment either in its raw state or burnt

— umber adjective

umbilical cord noun : a cord containing blood vessels that connects the navel of a fetus with the placenta of its mother

um·bi·li·cus noun, plural um·bi·li·ci or um·bi·li·cus·es : NAVEL

— um·bil·i·cal adjective

um·bra noun, plural umbras or um·brae 1 : a shaded area : SHADE

2 : the conical part of the shadow of a celestial body from which the sun's light is completely blocked

um·brage noun 1 : SHADE; also : FOLIAGE

2 : a feeling of pique or resentment at some often fancied slight or insult : OFFENSE

Synonyms

dudgeon, huff, offense, peeve, pique, resentment—more at PIQUE

um·brel·la noun 1 : a collapsible shade for protection against weather consisting of fabric stretched over hinged ribs radiating from a center pole

2 : something that provides protection

3 : something that covers a range of elements

umi·ak noun : an open Eskimo boat made of a wooden frame covered with skins

1umpire noun [ORIGIN: ME oumpere, alter. of noumpere (the phrase a noumpere being understood as an oumpere), fr. AF nounpier single, odd, fr. non not + per equal, fr. L par]

1 : one having authority to decide finally a controversy or question between parties

2 : an official in a sport who rules on plays

Synonyms

arbiter, arbitrator, judge, referee—more at JUDGE

2umpire verb : to supervise or decide as umpire

Synonyms

adjudicate, arbitrate, decide, determine, judge, referee, rule, settle—more at JUDGE

ump·teen adjective : very many : indefinitely numerous

— ump·teenth adjective

UN abbreviation United Nations

un- prefix 1 : not : IN-, NON-

2 : opposite of : contrary to

List of self-explanatory words with the prefix un-:

unabated

unabsorbed

unabsorbent

unacademic

unaccented

unacclimatized