Etymology
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bittersweet (adj.)

"uniting bitterness and sweetness," 1610s, from bitter (adj.) + sweet (adj.). Perhaps older, as the same word is used as a noun in Middle English (late 14c.) for drinks or experiences that are both bitter and sweet and especially in reference to a type of apple; later of woody nightshade (1560s). Greek had a similarly formed compound, glykypikros, literally "sweet-bitter."

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Definitions of bittersweet
1
bittersweet (n.)
poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America;
Synonyms: bittersweet nightshade / climbing nightshade / deadly nightshade / poisonous nightshade / woody nightshade / Solanum dulcamara
bittersweet (n.)
twining shrub of North America having yellow capsules enclosing scarlet seeds;
Synonyms: American bittersweet / climbing bittersweet / false bittersweet / staff vine / waxwork / shrubby bittersweet / Celastrus scandens
2
bittersweet (adj.)
tinged with sadness;
a movie with a bittersweet ending
bittersweet (adj.)
having a taste that is a mixture of bitterness and sweetness;
Synonyms: semisweet
From wordnet.princeton.edu