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English definition of “tonic”

tonic

noun uk   /ˈtɒn.ɪk/ us    /ˈtɑː.nɪk/

tonic noun (MEDICINE)

[C] a liquid medicine that has the general effect of making you feel better rather than treating a particular health problem that you might have [S] informal something that makes you feel stronger or happier: The magazine is lively and interesting - the pictures alone are a tonic.

tonic noun (DRINK)

[C or U] (also tonic water) fizzy (= with bubbles) water with a bitter taste that can be drunk on its own or added to alcoholic drinks: Two gin and tonics, please.
(Definition of tonic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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