tonic

Definition (noun): lime- or lemon-flavored carbonated water containing quinine

Definition (noun): a sweet drink containing carbonated water and flavoring

Example: in New England they call sodas tonics

Definition (noun): (music) the first note of a diatonic scale

Definition (noun): a medicine that strengthens and invigorates

Definition (adjective): of or relating to or producing normal tone or tonus in muscles or tissue

Example: a tonic reflex

Definition (adjective): of or relating to or producing normal tone or tonus in muscles or tissue

Example: tonic muscle contraction

Definition (adjective): employing variations in pitch to distinguish meanings of otherwise similar words

Example: Chinese is a tonal language

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

Example: a tonic syllables carries the main stress in a word

Definition (adjective): relating to or being the keynote of a major or minor scale

Example: tonic harmony

Definition (adjective): imparting vitality and energy

Example: the bracing mountain air