Definition of hypertonic in English:



  • 1Biology
    Having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.

    • ‘Vasopressin continued to act in patients excreting isotonic or hypertonic urine, so hypotonic intake must be avoided in them.’
    • ‘In hypertonic syndromes the brain compensates by increasing osmoles in the brain cells.’
    • ‘Neurologically they are hypertonic and may have frequent episodes of apnea.’
    • ‘If water flows from the cell into the stronger solution outside, the external solution is said to be hypertonic.’
    • ‘Being a breakdown product of hemoglobin, urine is colored by urobilinogen and is more hypertonic than plasma and more acid.’
  • 2Physiology
    Of or in a state of abnormally high muscle tone.

    ‘Whilst the muscles are not necessarily hypertonic in osteoporosis they are likely to have undergone fibrotic changes.’
    ‘When the nervous system becomes involved, the muscle tendon bundles remain hypertonic and pain reflexes in the area are activated.’