1.lime- or lemon-flavored carbonated water containing quinine
2.a sweet drink containing carbonated water and flavoring;
in New England they call sodas tonics
3.(music) the first note of a diatonic scale
4.a medicine that strengthens and invigorates
5.of or relating to or producing normal tone or tonus in muscles or tissue;
a tonic reflex
6.employing variations in pitch to distinguish meanings of otherwise similar words;
Chinese is a tonal language
7.used of syllables;
a tonic syllables carries the main stress in a word
8.relating to or being the keynote of a major or minor scale;
tonic harmony
9.imparting vitality and energy;
the bracing mountain air