nonionic

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non·ion·ic

(non'ī-on'ik),
A class of radiographic contrast media that do not ionize in solution, thereby decreasing effective osmolarity and toxicity.
See also: low osmolar contrast agent.

non·i·on·ic

(non'ī-on'ik)
Radiographic contrast media that do not ionize in solution, decreasing effective osmolarity and toxicity.