Definitions

1. adjective

Lacking in tonic quality; of or relating to a medicine that depresses the nervous system, especially by reducing the excitability of the heart.

“The doctor warned that the sedative’s nontonic properties could lead to serious side effects.”

2. noun

A medicine or substance that has a depressing effect on the nervous system, especially by reducing the excitability of the heart.

“The patient was administered a nontonic to calm her racing heart.”