Meaning of tonic
Definition of tonic
(adj)
of or relating to or producing normal tone or tonus in muscles or tissue; "a tonic reflex"; "tonic muscle contraction"
employing variations in pitch to distinguish meanings of otherwise similar words; "Chinese is a tonal language"
(used of syllables) bearing the principle stress, usually accompanied by a change in pitch; "a tonic syllables carries the main stress in a word"
a medicine that strengthens and invigorates