vasopressin noun. [veɪzǝʊ'prɛsɪn] E20.
[formed as VASOPRESSOR + -IN¹.]
Physiology. A polypeptide pituitary hormone in humans and other mammals which promotes the retention of water by the kidneys and when given in large quantities raises the blood pressure by vasoconstriction. Also called antidiuretic hormone (ADH).

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