Pronunciation: /ˌhʌɪpəˈtɒnɪk/
adjective
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1 Biology having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.
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2 Physiology of or in a state of abnormally high muscle tone.

Derivatives
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Pronunciation: /-ˈtəʊnɪə/
noun -
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Pronunciation: /-təˈnɪsɪti/
noun