"tonics" in the noun sense
1. tonic, tonic water, quinine water
lime- or lemon-flavored carbonated water containing quinine
2. pop, soda, soda pop, soda water, tonic
a sweet drink containing carbonated water and flavoring
"in New England they call sodas tonics"
3. tonic, keynote
music) the first note of a diatonic scale
4. tonic, restorative
a medicine that strengthens and invigorates
Source: WordNet® (An amazing lexical database of English)
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