(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

(medicine) The normal presence of tone or tension in a muscle or organ; tonus / (sciences) The ability of nonpenetrable solutes in a solution to exert an osmotic pressure upon a membrane

plural of tonicity

(obsolete) tonic

present participle of tonicize