- (a.) Characterized by continuous muscular contraction; as, tonic convulsions.
- (a.) Of or relating to tones or sounds; specifically (Phon.), applied to or distingshing, a speech sound made with tone unmixed and undimmed by obstruction, such sounds, namely, the vowels and diphthongs, being so called by Dr. James Rush (1833) " from their forming the purest and most plastic material of intonation.".
- (n.) A medicine that increases the strength, and gives vigor of action to the system.
- (a.) Increasing strength or the tone of the animal system; obviating the effects of debility, and restoring healthy functions.
- (n.) A tonic element or letter; a vowel or a diphthong.
- (a.) Of or pertaining to tension; increasing tension; hence, increasing strength; as, tonic power.
- (n.) The key tone or first tone of any scale.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). tonic. Retrieved September 23, 2026, from http://smartdefine.org/tonic/definitions/2073200 |
| Chicago | Webster's. 2011. "tonic" http://smartdefine.org/tonic/definitions/2073200 (accessed September 23, 2026). |
| Harvard | Webster's 2011, tonic, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/tonic/definitions/2073200>. |
| MLA | Webster's. "tonic" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/tonic/definitions/2073200> |