Definition of insulin noun from the Oxford Advanced Learner's Dictionary

 

insulin

 noun
noun
BrE BrE//ˈɪnsjəlɪn//
 
; NAmE NAmE//ˈɪnsəlɪn//
 
[uncountable]
 
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a chemical substance produced in the body that controls the amount of sugar in the blood (by influencing the rate at which it is removed); a similar artificial substance given to people whose bodies do not produce enough naturally insulin-dependent diabetes Word Origin early 20th cent.: from Latin insula ‘island’ + -in.
See the Oxford Advanced American Dictionary entry: insulin