isotonic

adj

Etymology: Etymology tree Ancient Greek ῐ̓́σος (ĭ́sos)lbor. English iso- Proto-Indo-European *ten- Proto-Indo-European *-os Proto-Indo-European *tónos Proto-Hellenic *tónos Ancient Greek τόνος (tónos) Proto-Indo-European *-kos Ancient Greek -κός (-kós) Ancient Greek -ικός (-ikós) Ancient Greek τονῐκός (tonĭkós) English tonic English isotonic From iso- + tonic.

1. Having the same osmotic pressure.
2. Having the same concentration of solutes as human blood.

   “Use an isotonic saline solution in your neti pot to prevent irritation of your nasal passages.”

3. Having equal tension.
4. Of or involving muscular contraction against resistance in which the length of the muscle changes. Antonym is isometric. Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens). See also Wikipedia:Isotonic (exercise physiology)
5. Having the same tone.