tonic

Etymology

It is borrowed from Ancient Greek τονικός (tonikós, “of or for stretching; of tones”),^{[2][3][4][5][6]} from τόνος (tónos, “a stretching, tension; tone”),^[3][2][5] from Proto-Indo-European *ten- (“to stretch”).^[3] The OED compares New Latin tonicus and French tonique, which Godefroy records in the 16th century;^[2] the Shorter Oxford, the Oxford Dictionary of English, Hoad and Klein take the English word through the French,^[7][8][9][6] and the AHD and Collins through the New Latin.^[10][11] For the musical senses Etymonline takes the word as formed anew from the musical sense of the noun tone with the suffix -ic.^[3]

Earliest recorded meaning

Pertaining to, consisting in or producing tension, especially of the muscles: 1649, in Bulwer's Pathomyotomia.^[2][4][5]

Semantic evolution

From 1684 the adjective referred to maintaining the tone, the normal healthy firmness, of tissues and organs,^[2][4][3] while from 1756 it described medicines and treatments that restore that tone, hence "bracing, invigorating", later also of mental and moral health.^[2][4][3] The noun, a tonic medicine, follows in 1799,^[2][3][4] or 1797 in Merriam-Webster,^[5] and the figurative "invigorating influence" in 1849, in Clough.^[2] Tonic water was sold from 1861 as water infused with quinine, held to aid digestion and stimulate the appetite, and gin and tonic is recorded from 1873,^[3] although the OED's first tonic alone for tonic water is from 1936.^[2] In music the adjective was applied from 1760–61 to the keynote, the tonic note,^[3][2][4] and the noun tonic, the keynote, follows in 1806;^[2][3] by 1896 it also meant the principal key of a composition.^[3] Its use for tone or accent in speech dates from 1849,^[2] and Tonic Sol-fa has named the system of teaching singing introduced by John Curwen since 1852.^[2] A verb, to give a tonic to, is recorded from 1825.^[2][5] In New England tonic is a carbonated soft drink,^[12] and in Australian slang, from 1934, a glass of alcohol.^[13]

Timeline

• 1649 – relating to muscular tension.^[2][4]
• 1684 – maintaining the healthy tone of the tissues.^[2][4]
• 1756 – restoring health and vigour; invigorating.^[2][4]
• 1760 – in music, of the keynote (tonic note).^[3][4]
• 1799 – noun, a tonic medicine.^[2][3]
• 1806 – noun, the keynote.^[2][3]
• 1825 – verb, to give a tonic to.^[2]
• 1849 – an invigorating influence; relating to tone or accent in speech.^[2]
• 1852 – Tonic Sol-fa.^[2]
• 1873 – gin and tonic.^[3]
• 1936 – tonic water.^[2]

Meanings

Noun

1. A medicine or other agent that restores or increases the body's tone or vigour.^[11][14][5]
2. Anything that invigorates or refreshes: The holiday was a tonic for the whole family.^[11][5][14]
3. Tonic water, carbonated water flavoured with quinine, often mixed with gin.^[11][14][2]
4. (music) The first note of a major or minor scale; the keynote; also a key or chord based on it.^[11][14][12]
5. (chiefly New England) A carbonated soft drink.^[12][14]
6. A liquid preparation for the scalp or hair.^[12]
7. A tonic accent.^[14]

Adjective

1. Producing or restoring physical, mental or emotional vigour.^[14][5][2]
2. (physiology) Of, relating to or producing tone in muscles or tissues; of muscular contraction, continuous or prolonged, as opposed to clonic.^[5][14][2]
3. (music) Of or based on the keynote.^[14][2][12]
4. (phonetics) Of a syllable, stressed or accented; also, relating to distinctions of tone in speech.^[14][2]

Verb

1. To give a tonic to; to strengthen or brace.^[5][2]

Word family

• tonically
• atonic
• cardiotonic
• hypertonic
• hypotonic
• isotonic

Related words

• tone
• tonicity
• tonus
• diatonic
• tension

Usage notes

A separate slang tonic, a halfpenny, recorded from 1821, is of unknown origin.^[13]

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g h i j k l m n o Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d e f g h i j Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
5. ^ a b c d e f g h i j Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
8. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
9. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
10. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
11. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
12. ^ a b c d e Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
13. ^ a b Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
14. ^ a b c d e f g h i j The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin