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Definition of BITTERSWEET
: something that is bittersweet; especially: pleasure alloyed with pain
a: a poisonous Eurasian woody vine (Solanum dulcamara) of the nightshade family that has purple flowers and oval reddish berries and is naturalized in North America
b: a North American poisonous woody vine (Celastrus scandens) of the staff-tree family having clusters of small greenish flowers succeeded by yellow capsules that open when ripe and disclose the scarlet aril
: a sprawling poisonous weedy nightshade (Solanum dulcamara) with purple flowers and oval reddish orange berries that is the source of dulcamara
Any of several vines with colourful fruit. The genus Celastrus (family Celastraceae) includes American bittersweet, or staff vine (C. scandens), and Oriental bittersweet (C. orbiculatus), woody vines grown as ornamentals. Oriental bittersweet is a more vigorous climber than the American species. Both types climb by twining around supports. Another bittersweet, Solanum dulcamara, belongs to the nightshade family.