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ultrasonics
ultrasonogram
ultrasonography
ultrasound
ultrastructure
ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
ululate
Uluru
Ulysses
um
Umayyad
umbel
umbelliferous
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ultravirus
ul·tra·vi·rus [ últrə vrəss ] (plural ul·tra·vi·rus·es)


noun 
Definition:
 
very small virus: a virus small enough to pass through an ultrafilter

ul·tra·vi·ral [ ùltrə vrəl ] adjective
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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