Bittersweet nightshade, Solanum dulcamara.

Bittersweetness.

(US) A vine, of the genus Celastrus, having small orange fruit that open to reveal red seeds.

A variety of apple with a bittersweet taste.

Any variety of clam in the family Glycymerididae

(color) A pinkish-orange color. Any color in between scarlet and orange.

Both bitter and sweet.

(figurative) Expressing contrasting emotions of pain and pleasure.

(color) Of bittersweet color.