/ˈtɑːnɪk/
tonic
BrE /ˈtɒnɪk/
NAmE /ˈtɑːnɪk/
(also ˈtonic water) [U, C]
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
[C]
a medicine that makes you feel stronger and healthier, taken especially when you feel tired
herbal tonics
[C, U]
a liquid that you put on your hair or skin in order to make it healthier
skin tonic
[C, usually singular] (old-fashioned)
anything that makes people feel healthier or happier
The weekend break was just the tonic I needed.
[C] (music)
the first note of a scale of eight notes
(also ˌtonic ˈsyllable) [C] (phonetics)
the syllable in a tone unit on which a change in pitch takes place