1. (adj.)bittersweet both bitter and sweet to the taste: bittersweet chocolate.
2. bittersweet both pleasant and painful or regretful: a bittersweet memory.
3. (n.)bittersweet a climbing or trailing plant, Solanum dulcamara, of the nightshade family, having small, violet, star-shaped flowers with a protruding yellowcenter and scarlet berries.
4. (noun)bittersweet a climbing shrub, with oval coral-red berries (Solanum dulcamara); woody nightshade. The whole plant is poisonous, and has a taste at first sweetish and then bitter. The branches are the officinal dulcamara
5. (noun)bittersweet an American woody climber (Celastrus scandens), whose yellow capsules open late in autumn, and disclose the red aril which covers the seeds; -- also called Roxbury waxwork
Definitions of bittersweet 
