Definitions of tonic:

  • noun:   a medicine that strengthens and invigorates
  • noun:   (music) the first note of a diatonic scale
  • noun:   lime- or lemon-flavored carbonated water containing quinine
  • noun:   a sweet drink containing carbonated water and flavoring
    Example: "In New England they call sodas tonics"
  • adjective:   used of syllables
    Example: "A tonic syllables carries the main stress in a word"
  • adjective:   relating to or being the keynote of a major or minor scale
    Example: "Tonic harmony"
  • adjective:   employing variations in pitch to distinguish meanings of otherwise similar words
  • adjective:   of or relating to or producing normal tone or tonus in muscles or tissue
    Example: "A tonic reflex"
  • adjective:   imparting vitality and energy
  • name:  A surname (very rare: popularity rank in the U.S.: #67098)