/'tɒnɪk; `tɑnɪk/
n
1 [C, U] medicine that gives strength or energy, taken after illness or when tired 补药; 滋补品.
2 [C usu sing 通常作单数] (fig 比喻) anything that makes people feel healthier or happier 使人感到健康或快乐的事物
*Praise can be a fine tonic. 赞美的话有时真让人感到美滋滋的.
* The good news acted as a tonic on us all. 那个好消息使我们大家欢欣鼓舞.
* [attrib 作定语] the tonic effects of sea air 海上空气的保健作用.
3 [C, U] = tonic water.
4 [C] (music 音) keynote 主音.

n
[Date: 1600-1700; Language: Greek;Origin: tonikos, from tonos; TONE¹]
[U and C]also'tonic .water
a clear bitter-tastingdrink that you can mix with alcoholic drinks such as gin or vodka
　She sat and sipped a gin and tonic.
[C]
a drink that you have as a medicine to give you more energy or strength when you feel tired
　A lot of people need a tonic at the end of the winter.
[C usually singular]BrE
something that makes you feel happy and full of energy
　A weekend by the sea was the perfect tonic.
[C]
a liquid that you put on your hair or skin to improve it and make it more healthy
　a herbal skin tonic
[C usually singular]technical
the first note in a musical scale of eight notes