From The Collaborative International Dictionary of English v.0.48:

Tonic \Ton"ic\, n. [Cf. F. tonique, NL. tonicum.]
   1. (Phon.) A tonic element or letter; a vowel or a diphthong.
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   2. (Mus.) The key tone, or first tone of any scale.
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   3. (Med.) A medicine that increases the strength, and gives
      vigor of action to the system.
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   Tonic sol-fa (Mus.), the name of the most popular among
      letter systems of notation (at least in England), based on
      key relationship, and hence called "tonic." Instead of the
      five lines, clefs, signature, etc., of the usual notation,
      it employs letters and the syllables do, re, mi, etc.,
      variously modified, with other simple signs of duration,
      of upper or lower octave, etc. See Sol-fa.
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From The Collaborative International Dictionary of English v.0.48:

Tonic \Ton"ic\, a. [Cf. F. tonigue, Gr. ?. See Tone.]
   1. 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."
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   2. Of or pertaining to tension; increasing tension; hence,
      increasing strength; as, tonic power.
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   3. (Med.) Increasing strength, or the tone of the animal
      system; obviating the effects of debility, and restoring
      healthy functions.
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   4. (Med.) Characterized by continuous muscular contraction;
      as, tonic convulsions.
      [Webster 1913 Suppl.]

   Tonic spasm. (Med.) See the Note under Spasm.
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