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tonic

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tonic/ˈtɑːnɪk/noun
pluraltonics
tonic
/ˈtɑːnɪk/
noun
pluraltonics
Learner's definition of TONIC  
[count, noncount]  : a type of water that has bubbles in it, has a bitter taste, and is often used in alcoholic drinks
— called also tonic water
[count] 
: something that makes you feel healthier and more relaxed — usually singular
   b  : a medicine that brings you back to a normal physical or mental condition
   c  somewhat old-fashioned  : a liquid that is used on your hair to make it healthier
[count]music  : the main note of a musical key
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