What is the meaning of Bittersweet?

Both bitter and sweet.

Expressing contrasting emotions of pain and pleasure.

Of bittersweet color .

Bittersweet nightshade (Solanum dulcamara).

Bittersweetness.

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

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

Source: wiktionary.org