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- Dictionaryton·ic/ˈtänik/
noun
- 1. a medicinal substance taken to give a feeling of vigor or well-being. Similar
- 2. short for tonic water
adjective
- 1. giving a feeling of vigor or well-being; invigorating: "a tonic body shampoo"
- 2. relating to or denoting the first degree of a scale.
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