Definition of: bittersweet

(bit′ər·swēt′) noun
1. A coarse trailing plant, the woody nightshade, having oval bright-red berries. Its twigs and root have a taste at first bitter and afterward sweetish.
2. A shrubby or climbing plant (Celastrus scandens), with green flowers succeeded by orange pods that display a red aril.
—adjective Combining bitter and sweet.