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hypertonic (adj.)

"with excessive tension or tone," 1809, from hyper- "over, exceedingly, to excess" + tonic. Related: Hypertonia; hypertonicity.

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Definitions of hypertonic

hypertonic (adj.)
(of living tissue) in a state of abnormally high tension;
hypertonic muscle tissue
hypertonic (adj.)
(of a solution) having a higher osmotic pressure than a comparison solution;
From wordnet.princeton.edu