A liquid used in mixed drinks or as a tonic into which bitter herbs have been steeped (it can also be found in powdered form for adding to mixed drinks).

plural of bitter

Third-person singular simple present indicative form of bitter

Full of bitterness.

plural of bittering

Causing a bitter taste or smell.

A bitter compound used in adulterating beer.

present participle of bitter

comparative form of bitter: more bitter

The quality of having a bitter taste. / The quality of feeling bitter; acrimony, resentment; the quality of exhibiting such feelings. / The quality of eliciting a bitter, humiliating or harsh feeling.