tonics is a form of:

Tonic



noun
1.
(A drug medicine, etc., for improving bodily health, anything they restores people's energy or good spirits, a keynote in music, tonic water) drink a tonic ថ្នាំលើកកម្លាំង
2.
(MUSIC) Tonic of the key សូរផ្ដើម (តានិក) (ភ្លេង)
3.
(វេជ្ជសាស្ត្រ) សាច់ដុំកន្ត្រាក់
4.
(វេជ្ជសាស្ត្រ) ថ្នាំលើកកំលាំង, ថ្នាំជំនួយកំលាំង
adjective
1.
(Having the effect of a tonic toning up the muscles, etc) ដែលធ្វើអោយខ្លាំងក្លា
Example: A tonic to build one's strength, the tonic effect of a warm shower.
ENGLISH MEANING
noun
1.
A tonic element or letter; a vowel or a diphthong.
2.
The key tone, or first tone of any scale.
3.
A medicine that increases the strength, and gives vigor of action to the system.
adjective
1.
Characterized by continuous muscular contraction; as, tonic convulsions.
2.
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."
3.
Of or pertaining to tension; increasing tension; hence, increasing strength; as, tonic power.
4.
Increasing strength, or the tone of the animal system; obviating the effects of debility, and restoring healthy functions.