Meaning of proinsulin

pro•in•su•lin

Pronunciation: (prō-in'su-lin, -ins'yu-), [key]
— n. Biochem.
  1. the prohormone of insulin, converted into insulin by enzymatic removal of part of the molecule.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.