Meaning

noun lime- or lemon-flavored carbonated water containing quinine

noun a sweet drink containing carbonated water and flavoring

noun (music) the first note of a diatonic scale

originEtymology tree Proto-Indo-European *ten- Proto-Indo-European *-os Proto-Indo-European *tónos Proto-Hellenic *tónos Ancient Greek τόνος (tónos) Proto-Indo-European *-kos Ancient Greek -κός (-kós) Ancient Greek -ικός (-ikós) Ancient Greek τονῐκός (tonĭkós) English tonic From Ancient Greek τονικός (tonikós), from τόνος (tónos). 17th century writers believed health to be derived from firmly stretched…

Etymology from Wiktionary, CC BY-SA 3.0