Tonic

{ton;-ik) [tovoq, tone]. I. Pertaining to tone; producing normal tone or tension. 2. An agent producing normal tone of an organ or part. T., Cardiac, one strengthening the heart-muscle. T., Intestinal, one strengthening the tone of the intestines. T., Nervine, one increasing the tone of the nervous system. T., Stomachic, one increasing the tone of the stomach. T., Vascular, one increasing the tone or tension of the blood-ve els. 3. Characterized by continuous tension or contraction, as, e.g., a T. spasm, T. convulsion. 629