Skip to Content
Medical Term:


Pronunciation: ton'ik


  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]

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.