- 1. In a state of continuous unremitting action; denoting especially a prolonged muscular contraction. 2. Invigorating; increasing physical or mental tone or strength. 3. A remedy purported to restore enfeebled function and promote vigor and a sense of well-being; tonics are qualified, according to the organ or system on which they are presumed to act, as cardiac, digestive, hematic, vascular, nerve, uterine, general, etc. [G. tonikos, fr. tonos, tone]- bitter t. a t. of bitter taste, such as quinine, gentian, quassia, etc., which acts chiefly by stimulating the appetite and improving digestion.
* * *ton·ic 'tän-ik adj1 a) characterized by tonus <\tonic contraction of muscle> also marked by or being prolonged muscular contraction <\tonic convulsions>b) producing or adapted to produce healthy muscular condition and reaction of organs (as muscles)2 a) increasing or restoring physical or mental toneb) yielding a tonic substanceton·i·cal·ly 'tän-i-k(ə-)lē advtonic n an agent (as a drug) that increases body tone
* * *1. adj.a) relating to normal muscle tone.2. n. a medicinal substance purporting to increase vigour and liveliness and produce a feeling of well-being: beneficial effects of tonics are probably due to their placebo action.
* * *ton·ic (tonґik) [Gr. tonikos] 1. producing and restoring the normal tone. 2. characterized by continuous tension. 3. a term formerly used for a class of medicinal preparations believed to have the power of restoring normal tone to tissue; named for the organ or system on which they acted, e.g., cardiac tonic, digestive tonic.
Medical dictionary. 2011.