Main Entry:

²tonic

Function:

noun

Date:

1797

1: the first tone of a major or minor scale : keynote2 a: an agent (as a drug) that increases body tone b: one that invigorates, restores, refreshes, or stimulates <a day in the country was a tonic for him> c: a liquid preparation for the scalp or hair dchiefly New England : a carbonated flavored beverage e: tonic water3: a voiced sound