Literally, increasing tension; hence, increasing strength, as tonic power.

In medicine, increasing strength, or the tone of the animal system; obviating the effects of debility, and restoring healthy functions.

Relating to tones or sounds.

Extended. Tonic spasm, in medicine, a rigid contraction of the muscles without relaxation, as in tetanus.

A medicine that increases the tone of the muscular fiber, and gives vigor and action to the system. A medicine which increases the tone or strength of the body.

In music, the key-note or principal sound which generates all the rest.

In music, a certain degree of tension, or the sound produced by a vocal string in a given degree of tension.