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tonic (ton´ik)

1. In a state of continuous unremitting action; denoting especially a 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; qualified, according to the organ or system on which they are presumed to act, as cardiac, digestive, hematic, vascular, nervine, 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.
tonic t. sustained contractures of skeletal muscle as occur during convulsions.


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