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  1. tonicity love

Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Normal firmness or functional readiness in body tissues or organs.
  2. n. The sustained partial contraction of resting or relaxed muscles.

Century Dictionary and Cyclopedia

  1. n. In zoology, occasionally employed to denote the quality of dead, as well as living, tissue.
  2. n. Tone; the state or property of possessing tone or of being tonic; specifically, in physiol; the elasticity of living parts—a property of the muscles which is distinct from true irritability, and determines the general tone of the solids. In virtue of this power the dilators of the larynx keep this organ open, the face is kept symmetrical, the sphincters are kept closed, etc.
  3. n. In music. See the quotation.

Wiktionary

  1. n. medicine The normal presence of tone or tension in a muscle or organ; tonus
  2. n. sciences The ability of a solution to exert an osmotic pressure upon a membrane

GNU Webster's 1913

  1. n. (Physiol.) The state of healthy tension or partial contraction of muscle fibers while at rest; tone; tonus.

WordNet 3.0

  1. n. the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli

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‘tonicity’ has been looked up 1791 times, added to 2 lists, and has a Scrabble score of 13.