Definition of hypertonic in English:



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

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