Source : Webster's Revised Unabridged Dictionary (1913)

Humulin \Hu"mu*lin\, n. [NL. Humulus, the genus including the
   hop.]
   An extract of hops.

Source : WordNet®

Humulin
     n : a form of insulin (trade name Humulin) made from recombinant
         DNA that is identical to human insulin; used to treat
         diabetics who are allergic to preparations made from beef
         or pork insulin [syn: {recombinant human insulin}]