Definition of kinin in English:



  • 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.

    Also called cytokinin

    ‘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.’



/ˈkīnən/ /ˈkaɪnən/


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