Tonicity

//təˈnɪsɪti// noun

Definitions

Noun
  1. 1
    The normal presence of tone or tension in a muscle or organ; tonus
  2. 2
    the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli wordnet
  3. 3
    The ability of nonpenetrable solutes in a solution to exert an osmotic pressure upon a membrane

Etymology

From tonic + -ity.

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