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Adjective: isotonic  `I-su'tó-nik
  1. (used of solutions) having the same or equal osmotic pressure
    - isosmotic
     
  2. Relating to or characterized by the equal intervals of a musical scale
    "isotonic tuning"
     
  3. Of or involving muscular contraction in which tension is constant while length changes
     
  4. Of two or more muscles; having equal tension

See also: tense, tone

Antonym: hypertonic, hypotonic, isometric

Encyclopedia: Isotonic