tonic
US /ˈtɑː.nɪk/
UK /ˈtɑː.nɪk/
1.
a medicinal substance taken to give a feeling of vigor or well-being
:
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After a long illness, the doctor prescribed a general tonic to help him recover.
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The fresh mountain air was a real tonic for her.
2.
a carbonated soft drink, typically flavored with quinine, often mixed with gin or vodka
:
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He ordered a gin and tonic at the bar.
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Do you prefer your tonic with or without ice?
1.
relating to or restoring normal tone or tension in muscle or other tissue
:
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The exercise had a tonic effect on her muscles.
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The doctor prescribed a tonic medication to improve circulation.
2.
relating to the first note of a scale (the keynote)
:
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The melody always resolves back to the tonic note.
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In classical music, the tonic chord provides a sense of resolution.