"Tonic" is a word in ENGLISH

A medicine that increases the strength, and gives vigor of
action to the system.

A tonic element or letter; a vowel or a diphthong.

Increasing strength, or the tone of the animal system;
obviating the effects of debility, and restoring healthy functions.

Of or relating to tones or sounds; specifically (Phon.),
applied to, or distingshing, a speech sound made with tone unmixed and
undimmed by obstruction, such sounds, namely, the vowels and
diphthongs, being so called by Dr. James Rush (1833) \" from their
forming the purest and most plastic material of intonation.\"

The key tone, or first tone of any scale.

Of or pertaining to tension; increasing tension; hence,
increasing strength; as, tonic power.