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ultramicroscope
ultramicroscopic
ultramodern
ultramontane
ultramontanism
ultramundane
ultranationalism
ultrashort
ultrasonic
ultrasonic testing
ultrasonic welding
ultrasonics
ultrasonogram
ultrasonography
ultrasound
ultrastructure
ultraviolet
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um
um [ um ]


interjection 
Definition:
 
representing hesitation in speech: a word used in writing to represent the kind of grunting sound that people make when they hesitate in speaking
[Early 17th century. Representing an inarticulate sound]
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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