TON'IC, a. [L. tonus. See Tone.] 1. Literally, increasing tension; hence, increasing strength, as tonic power.2. In medicine, increasing strength, or the tone of the animal system; obviating the effects of debility, and restoring healthy functions.3. Relating to tones or sounds.4. Extended. [Not in use.]Tonic spasm, in medicine, a rigid contraction of the muscles without relaxation, as in tetanus, &c. TON'IC, n. 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.1. In music, the key-note or principal sound which generates all the rest.2. In music, a certain degree of tension, or the sound produced by a vocal string in a given degree of tension. |
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
