Definition of kinin in English:


Pronunciation /ˈkīnən/ /ˈkaɪnən/


  • 1Biochemistry
    Any of a group of substances formed in body tissue in response to injury. They are polypeptides and cause vasodilation and smooth muscle contraction.

    • ‘During states of ineffective arterial volume, local production of vasodilatory prostanoids and kinins in the kidney offsets the decrease in renal blood flow and helps maintain the glomerular filtration rate.’
    • ‘This same converting enzyme also breaks down kinins, which are powerful vasodilators, and therefore tend to lower the blood pressure.’
    • ‘In addition, the release of vasoactive kinins from muscle may interfere with renal hemodynamics.’
    • ‘The classic pathways of complement and kinins are activated and attract the inflamed cells.’
    • ‘Three different pathways may lead to kinin formation during inflammation: the generation of bradykinin as a result of activation of the Hageman factor and the production of plasma kallikrein; the production of lysylbradykinin by tissue kallikreins; and the action of cellular proteases in kinin formation.’
  • 2Botany
    A compound that promotes cell division and inhibits aging in plants.

    • ‘Maybe these cells would differ in sensitivity to auxin or kinin.’
    • ‘Coconut milk is recognized as a rich source of plant cell division inducers, which have become known as kinins.’
    • ‘Other topical therapies new to the anti-aging scene include plant kinins which appear to have both anti-irritant and photoaging reversal properties with no perceived irritation.’


1950s from Greek kinein ‘to move’+ -in.



/ˈkīnən/ /ˈkaɪnən/