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ultrasonography
ultrasound
ultrastructure
ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
ululate
Uluru
Ulysses
um
Umayyad
umbel
umbelliferous
umbellule
umber
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ululate
ul·u·late [ ylyə làyt, úllyə làyt ] (past and past participle ul·u·lat·ed, present participle ul·u·lat·ing, 3rd person present singular ul·u·lates)


intransitive verb 
Definition:
 
howl: to howl or wail, in grief or in jubilation
[Early 17th century. < Latin ululare, an imitation of the sound]

ul·u·la·tion [ ylyə láysh'n, ùllyə láysh'n ] noun
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