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ultrasonic testing
ultrasonic welding
ultrasonics
ultrasonogram
ultrasonography
ultrasound
ultrastructure
ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
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umbilicus

um·bil·i·cus [ um bíllikəss, ùmbi lkəss ] (plural um·bil·i·ci [ um bílli s, ùmbi l s ] or um·bil·i·cus·es)


noun 
Definition:
 
1. anatomy  ( technical )
Same as  navel


2. hollow resembling navel: a dip or hollow that resembles a navel, e.g. the hollow at each end of the shaft of a feather

[Late 17th century. < Latin< Indo-European]
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