An increase in the osmotic concentration of a solution expressed as osmoles of solute per liter of solution.

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hy·per·os·mo·lar·i·ty -'lar-ət-ē n, pl -ties the condition esp. of a bodily fluid of having abnormally high osmolarity <\hyperosmolarity occurs in dehydration, uremia, and hyperglycemia with or without ketoacidosis (R. W. P. Cutler)>
hy·per·os·mo·lar .hī-pə-.räz-'mō-lər adj

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hy·per·os·mo·lar·i·ty (hi″pər-oz″mo-larґĭ-te) abnormally increased osmolar concentration.

Medical dictionary. 2011.

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