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unruly
UNRWA
unsaddle
unsaddling enclosure
unsaid
unsatisfactory
unsaturate
unsaturated
unsaturation
unsavory
unsay
unsayable
unscathed
unschooled
unscientific
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unscrew
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unsaturation
un·sat·u·ra·tion [ ùn sachə ráysh'n ]


noun 
Definition:
 
presence of bonds in organic molecule: the presence of one or more double or triple bonds in an organic molecule
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