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ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
ululate
Uluru
Ulysses
um
Umayyad
umbel
umbelliferous
umbellule
umber
umbilical
umbilical cord
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ultrasonic
ul·tra·son·ic [ ùltrə sónnik ]


adjective 
Definition:
 
high in frequency: describes sound waves that have frequencies above the upper limit of the normal range of human hearing, which is about 20 kilohertz

ul·tra·son·i·cal·ly adverb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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