khellin
noun
khel·lin
variants:
also kellin \ ˈkel-ən 
\
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Medical Definition of khellin
: a crystalline compound C14H12O5 obtained from the fruit of a Middle Eastern plant (Ammi visnaga) of the family Umbelliferae and used as an antispasmodic in asthma and a coronary vasodilator in angina pectoris