Definition of "tonic"
tonic1
/ˈtɒnɪk/
adjective
comparative more tonic, superlative most tonic
(physics, pathology) Pertaining to tension, especially of muscles.
(medicine, neuroscience) In a state of continuous unremitting action.
verb
third-person singular simple present tonics, present participle tonicking, simple past and past participle tonicked
(medicine, archaic) To restore or invigorate.
tonic2
/ˈtɒnɪk/