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ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
ululate
Uluru
Ulysses
um
Umayyad
umbel
umbelliferous
umbellule
umber
umbilical
umbilical cord
umbilicate
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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]
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