Meaning of spermidine

sper•mi•dine

Pronunciation: (spûr'mi-dēn", -din), [key]
— n. Biochem.
  1. a biogenic polyamine, HN(CH)NH(CH)NH, formed from putrescine, occurring widely in nature and first identified in semen.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.