Physiology. (of tissue) having less than the normal tone.
Physical Chemistry. noting a solution of lower osmotic pressure than another solution with which it is compared (opposed to hypertonic ). Compare isotonic ( def 1 ).

1890–95; hypo- + tonic

hypotonicity [hahy-poh-toh-nis-i-tee] , noun
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World English Dictionary
hypotonic (ˌhaɪpəˈtɒnɪk)
1.  pathol (of muscles) lacking normal tone or tension
2.  hypertonic Compare isotonic (of a solution) having a lower osmotic pressure than that of a specified, generally physiological, solution

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Medical Dictionary

hypotonic hy·po·ton·ic (hī'pō-tŏn'ĭk)

  1. Having less than normal tone or tension, as of muscles or arteries.

  2. Having a lower osmotic pressure than a reference solution.

hy'po·to·nic'i·ty (-tə-nĭs'ĭ-tē) n.
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Example sentences
When you sleep, muscle tone throughout your body decreases, or becomes hypotonic.
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