| 1. | both bitter and sweet to the taste: bittersweet chocolate. |
| 2. | both pleasant and painful or regretful: a bittersweet memory. |
| 3. | 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. |
| 4. | Also called climbing bittersweet. any climbing plant of the genus Celastrus, bearing orange capsules opening to expose red-coated seeds, esp. C. scandens. |
| 5. | pleasure mingled with pain or regret: the bittersweet of parting. |
| bittersweet nightshade n. A poisonous climbing or trailing plant (Solanum dulcamara) native to Eurasia and a widespread weed in North America, having violet flowers with recurved corolla lobes and red berries. Also called bittersweet, deadly nightshade. [After its roots, which are said to taste bitter, then sweet when chewed.] |