12. tonic (of a syllable) bearing the principalstress or accent, usu. accompanied by a change in pitch.
13. tonic pertaining to or based on the first tone of a musical scale: a tonic chord.
Etymology: (1640–50; < Gk tonikós pertaining to stretching or tones. See tone , -ic)
Definition of 'tonic'
Princeton's WordNet
1. (noun)tonic, tonic water, quinine water lime- or lemon-flavored carbonated water containing quinine
2. (noun)pop, soda, soda pop, soda water, tonic a sweet drink containing carbonated water and flavoring "in New England they call sodas tonics"
3. (noun)tonic, keynote (music) the first note of a diatonic scale
4. (adj)tonic, restorative a medicine that strengthens and invigorates
5. (adj)tonic of or relating to or producing normal tone or tonus in muscles or tissue "a tonic reflex"; "tonic muscle contraction"
6. (adj)tonic, tonal employing variations in pitch to distinguish meanings of otherwise similar words "Chinese is a tonal language"
7. (adj)tonic, accented used of syllables "a tonic syllables carries the main stress in a word"
8. (adj)tonic relating to or being the keynote of a major or minor scale "tonic harmony"
9. (adj)bracing, brisk, fresh, refreshing, refreshful, tonic imparting vitality and energy "the bracing mountain air"
Definition of 'tonic'
Webster Dictionary
1. (adj)tonic of or relating to tones or sounds; specifically (Phon.), applied to, or distingshing, a speech sound made with tone unmixed and undimmed by obstruction, such sounds, namely, the vowels and diphthongs, being so called by Dr. James Rush (1833) " from their forming the purest and most plastic material of intonation."
2. (adj)tonic of or pertaining to tension; increasing tension; hence, increasing strength; as, tonic power
3. (adj)tonic increasing strength, or the tone of the animal system; obviating the effects of debility, and restoring healthy functions
4. (noun)tonic a tonic element or letter; a vowel or a diphthong
5. (noun)tonic the key tone, or first tone of any scale
6. (noun)tonic a medicine that increases the strength, and gives vigor of action to the system
Definitions of tonic 
Afrikaans: tonikum
Arabic: مُقَوٍّ، مُنَشِّط
Bulgarian: средство за ободряване
Brazilian: tônico
Czech: tonikum
German: das Stärkungsmittel
Danish: opkvikkende middel; tonik
Greek: τονωτικό, δυναμωτικό
Spanish: tónico
Estonian: erguti
Farsi: داروی مقوی
Finnish: vahvistava lääke
French: tonique
Hebrew: שִיקוּי מְחַזֵק
Hindi: बलवर्धक औषधि
Croatian: tonik, sredstvo za jačanj
Hungarian: erősítő(szer)
Indonesian: tinikum
Icelandic: styrkjandi lyf
Italian: tonico
Japanese: 強壮剤
Korean: 강장제, 원기를 돋구는 것
Lithuanian: tonizuojantis vaistas
Latvian: tonizējošs līdzeklis
Malay: tonik
Dutch: tonicum
Norwegian: styrkemiddel/-medisin
Polish: środek tonizujący
Persian: داروی مقوی
Pashto: غاړه ييز، لهجه يې: مقوي، 
Portuguese: tónico
Romanian: tonic
Russian: тонизирующее средство
Slovak: tonikum
Slovenian: krepčilo
Serbian: tonik
Swedish: tonikum
Thai: ยาบำรุง
Turkish: tonik, kuvvet ilâcı
Taiwanese: 補藥
Ukrainian: тонізуючий, зміцнювальний
Urdu: ٹانک، قوت بخش دوا
Vietnamese: thuốc bổ
Chinese: 补药
