tonic

A medicine that strengthens and invigorates.

(music) the first note of a diatonic scale.

Lime- or lemon-flavored carbonated water containing quinine.

A sweet drink containing carbonated water and flavoring.

“in New England they call sodas tonics”

Employing variations in pitch to distinguish meanings of otherwise similar words.

(used of syllables) bearing the principle stress, usually accompanied by a change in pitch.

“a tonic syllables carries the main stress in a word”

Imparting vitality and energy.

Of or relating to or producing normal tone or tonus in muscles or tissue.

“a tonic reflex”

“tonic muscle contraction”

Relating to or being the keynote of a major or minor scale.

“tonic harmony”