Pronunciation: ( —adj.bit"ur swēt', bit'ur swēt"; —n.bit'ur-swēt"),[key] —adj. 1. both bitter and sweet to the taste: bittersweet chocolate. 2. both pleasant and painful or regretful: a bittersweet memory.
—n. 1. Also called woody nightshade. a climbing or trailing plant, Solanum dulcamara, of the nightshade family, having small, violet, star-shaped flowers with a protruding yellow center and scarlet berries.
2. Also called climbing bittersweet. any climbing plant of the genus Celastrus, bearing orange capsules opening to expose red-coated seeds, esp. C. scandens. 3. pleasure mingled with pain or regret: the bittersweet of parting.