tonicとは何ですか?An agent, such as a medication, that restores or increases body tone.An invigorating, refreshing, or restorative agent or influence.See tonic water.Boston See soft drink.Music The first note of a diatonic scale; the keynote.Linguistics A tonic accent.Producing or stimulating physical, mental, or emotional vigor.Physiology Of, relating to, or producing tone or tonicity in muscles or tissue: a tonic reflex. Medicine Characterized by continuous tension or contraction of muscles: a tonic convulsion or spasm. Music Of or based on the keynote.Stressed, as a syllable; accented.