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Definitions of tonic:

noun:   a medicine that strengthens and invigorates
noun:   (music) the first note of a diatonic scale
noun:   lime- or lemon-flavored carbonated water containing quinine
noun:   a sweet drink containing carbonated water and flavoring
Example: "In New England they call sodas tonics"

adjective:   used of syllables
Example: "A tonic syllables carries the main stress in a word"

adjective:   relating to or being the keynote of a major or minor scale
Example: "Tonic harmony"

adjective:   employing variations in pitch to distinguish meanings of otherwise similar words
adjective:   of or relating to or producing normal tone or tonus in muscles or tissue
Example: "A tonic reflex"

adjective:   imparting vitality and energy
name:  A surname (very rare: popularity rank in the U.S.: #67098)

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Alternative Terms
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