(physics, pathology) Pertaining to tension, especially of muscles. / Restorative, curative or invigorating. / (medicine, neuroscience) In a state of continuous unremitting action.

A substance with medicinal properties intended to restore or invigorate. / Tonic water. / (US, Eastern Massachusetts) Any of various carbonated, non-alcoholic beverages; soda pop.

(medicine, archaic) To restore or invigorate.

(music) Pertaining to or based upon the first note of a diatonic scale. / Pertaining to the accent or stress in a word or in speech.

(music) The first note of a diatonic scale; the keynote. / (music) The triad built on the tonic note. / (phonetics) A tonic element or letter; a vowel or a diphthong.

plural of tonic

plural of tonic water

An alcoholic beverage made with vodka and tonic water

A liquid or gelatinous substance applied to the hair on one's head to improve its appearance in various ways.

plural of hair tonic