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1. Of or relating to or producing normal tone or tonus in muscles or tissue
   "a tonic reflex"; "tonic muscle contraction"
    
2. Employing variations in pitch to distinguish meanings of otherwise similar words
   - tonal
    
3. Used of syllables
   "a tonic syllables carries the main stress in a word"
   - accented
    
4. Relating to or being the keynote of a major or minor scale
   "tonic harmony"
    
5. Imparting vitality and energy
   - bracing, brisk, fresh, refreshing, refreshful

1. Lime- or lemon-flavoured carbonated water containing quinine
   - tonic water, quinine water
    
2. A sweet drink containing carbonated water and flavouring
   "in New England they call sodas tonics"
   - pop, soda, soda pop [N. Amer], soda water
    
3. (music) the first note of a diatonic scale
   - keynote
    
4. A medicine that strengthens and invigorates
   - restorative

Derived forms: tonics

See also: invigorating, tonal, tone

Type of: medicament, medication, medicinal drug, medicine, musical note, note, soft drink, tone

Antonym: atonic

Part of: gin and tonic

Encyclopedia: Tonic