tonic

noun
  1. a medicinal substance taken to give a feeling of vigor or well-being
  2. tonic water; a carbonated soft drink flavored with quinine
  3. the first note of a musical scale; the keynote
  4. Usage: music
adjective
  1. giving a feeling of vigor or well-being; invigorating
  2. relating to or based on the first note of a musical scale
  3. Usage: music

Examples