kinin
noun
ki·nin ˈkī-nən 
1
: any of various polypeptide hormones that are formed locally in the tissues and cause dilation of blood vessels and contraction of smooth muscle
2
: cytokinin
Word History
Etymology
Greek kinein to move, stimulate + English -in entry 1 — more at -kinesis
First Known Use
1954, in the meaning defined at sense 1
Medical Definition
kinin
noun
ki·nin ˈkī-nən
1
: any of various polypeptide hormones that are formed locally in the tissues and cause dilation of blood vessels and contraction of smooth muscle
2
: cytokinin