tonicity
noun
to·nic·i·ty
tō-ˈni-sə-tē 
1
: the property of possessing tone
especially
: healthy vigor of body or mind
2
: muscular tonus
Examples of tonicity in a Sentence
Recent Examples on the Web
Regulation of Body Fluids Vasopressin is responsible for maintaining the normal balance of fluids around cells, referred to as tonicity.
—
James Myhre & Dennis Sifris, Md, Verywell Health, 24 Sep. 2024
By increasing permeability, vasopressin can return the tonicity of body fluids to normal.
—James Myhre & Dennis Sifris, Md, Verywell Health, 24 Sep. 2024
That’s right—the key to losing inches off your waistline lies within a petite Parisian, fond of magenta lipstick and headbands, whose unique rémodelage technique is said to reshape silhouettes, reduce cellulite, boost tonicity, and release toxins.
—Zoe Ruffner, Vogue, 27 June 2017
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James Myhre & Dennis Sifris, Md, Verywell Health, 24 Sep. 2024
By increasing permeability, vasopressin can return the tonicity of body fluids to normal.
—James Myhre & Dennis Sifris, Md, Verywell Health, 24 Sep. 2024
That’s right—the key to losing inches off your waistline lies within a petite Parisian, fond of magenta lipstick and headbands, whose unique rémodelage technique is said to reshape silhouettes, reduce cellulite, boost tonicity, and release toxins.
—Zoe Ruffner, Vogue, 27 June 2017
Cite this Entry
“Tonicity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tonicity. Accessed 11 Jul. 2025.
Copy CitationMedical Definition
tonicity
noun
to·nic·i·ty
tō-ˈnis-ət-ē
plural tonicities
1
: the property of possessing tone
especially
: healthy vigor of body or mind
2
3
: the osmotic pressure of a solution
the cells swell and shrink with changing tonicity of the environment
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