Meaning

• A substance with medicinal properties intended to restore or invigorate.

  "We used to brew a tonic from a particular kind of root."

• Tonic water.

• (Massachusetts) Any of various carbonated, non-alcoholic beverages; soda pop.

• Someone or something that revitalises or reinvigorates.

Meaning

• Pertaining to tension, especially of muscles.

• Restorative, curative or invigorating.

  "The arrival of the new members had a tonic effect on the team."