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noun
1.
a medicine that invigorates or strengthens:
a tonic of sulphur and molasses.
2.
anything invigorating physically, mentally, or morally:
His cheerful greeting was a real tonic.
3.
quinine water.
4.
Music. the first degree of the scale; the keynote.
5.
Chiefly Eastern New England. soda pop.
6.
Phonetics. a tonic syllable or accent.
adjective
7.
pertaining to, maintaining, increasing, or restoring the tone or health of the body or an organ, as a medicine.
8.
invigorating physically, mentally, or morally.
9.
Physiology, Pathology.

pertaining to tension, as of the muscles.
marked by continued muscular tension:
a tonic spasm.

10.
using differences in tone or pitch to distinguish between words that are otherwise phonemically identical:
a tonic language.
11.
pertaining to tone or accent in speech.
12.
Phonetics. (of a syllable) bearing the principal stress or accent, usually accompanied by a change in pitch.
13.
Music.

of or relating to a tone or tones.
pertaining to or founded on the keynote, or first tone, of a musical scale:
a tonic chord.

adjective
1.
denoting or relating to the syllable before the one bearing the primary stress in a word
noun
1.
a medicinal preparation intended to improve and strengthen the functioning of the body or increase the feeling of wellbeing
2.
anything that enlivens or strengthens: his speech was a tonic to the audience
3.
Also called tonic water. a mineral water, usually carbonated and containing quinine and often mixed with gin or other alcoholic drinks
4.
(music)

the first degree of a major or minor scale and the tonal centre of a piece composed in a particular key
a key or chord based on this

5.
a stressed syllable in a word
adjective
6.
serving to enliven and invigorate: a tonic wine
7.
of or relating to a tone or tones
8.
(music) of or relating to the first degree of a major or minor scale
9.
of or denoting the general effect of colour and light and shade in a picture
10.
(physiol) of, relating to, characterized by, or affecting normal muscular or bodily tone: a tonic spasm
11.
of or relating to stress or the main stress in a word
12.
denoting a tone language

tonic ton·ic (tŏn’ĭk)
adj.

Of or producing tone or tonicity in muscles or tissue.

Characterized by continuous tension or contraction of muscles, as a convulsion or spasm.

Producing or stimulating physical, mental, or emotional vigor.

n.
An agent, such as a medication, that restores or increases body tone.
ton