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Meaning Of Tonic
a.
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."
a.
Of or pertaining to tension; increasing tension; hence,
increasing strength; as, tonic power.
a.
Increasing strength, or the tone of the animal system;
obviating the effects of debility, and restoring healthy functions.
n.
A tonic element or letter; a vowel or a diphthong.
n.
The key tone, or first tone of any scale.
n.
A medicine that increases the strength, and gives vigor of
action to the system.