tonic
noun
[ ˈtɒnɪk ]
• a medicinal substance taken to give a feeling of vigour or well-being.
• short for tonic water.
• the first note in a scale which, in conventional harmony, provides the keynote of a piece of music.
tonic
adjective
• giving a feeling of vigour or well-being; invigorating.
• "a tonic body shampoo"
• relating to or denoting the first degree of a scale.
• denoting or relating to the syllable within a tone group that has greatest prominence, because it carries the main change of pitch.
• relating to or restoring normal tone to muscles or other organs.
Origin:
mid 17th century: from French tonique, from Greek tonikos ‘of or for stretching’, from tonos (see tone).
