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

(usually in the plural bitters) A liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic. / A type of beer heavily flavored with hops.

Having an acrid taste (usually from a basic substance). / Harsh, piercing or stinging. / Hateful or hostile. / Cynical and resentful.

To make bitter.

(computing, informal, in combination) A hardware system whose architecture is based around units of the specified number of bits (binary digits).

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.

plural of bitterness