tonic

1 ENTRIES FOUND:
tonic /ˈtɑːnɪk/ noun
plural tonics
tonic
/ˈtɑːnɪk/
noun
plural tonics
Britannica Dictionary definition of TONIC
1 
[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
2 
[count]
a  : 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
3 
[count] music : the main note of a musical key