Definition of tonic noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈtɒnɪk//
    ; NAmE NAmE//ˈtɑːnɪk//
    Hair products and accessories
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  1. 1 (also tonic water) [uncountable, countable] a clear fizzy drink (= with bubbles in it) with a slightly bitter taste, that is often mixed with a strong alcoholic drink, especially gin or vodka a gin and tonic
  2. 2 [countable] a medicine that makes you feel stronger and healthier, taken especially when you feel tired herbal tonics
  3. 3[countable, uncountable] a liquid that you put on your hair or skin in order to make it healthier skin tonic See related entries: Hair products and accessories
  4. 4[countable, usually singular] (old-fashioned) anything that makes people feel healthier or happier The weekend break was just the tonic I needed.
  5. 5 [countable] (music) the first note of a scale of eight notes
  6. 6 (also tonic syllable) [countable] (phonetics) the syllable in a tone unit on which a change in pitch takes place
  7. Word Originmid 17th cent.: from French tonique, from Greek tonikos ‘of or for stretching’, from tonos ‘tension, tone’, from teinein ‘to stretch’.
See the Oxford Advanced American Dictionary entry: tonic

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