[ spur-mi-deen, -din ]
/ ˈspɜr mɪˌdin, -dɪn /

noun Biochemistry.

a biogenic polyamine, H2N(CH2)4NH(CH2)3NH2, formed from putrescine, occurring widely in nature and first identified in semen.

Origin of spermidine

First recorded in 1925–30; sperm- + -idine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medical definitions for spermidine

[ spûrmĭ-dēn′ ]


A polyamine compound found in ribosomes and living tissues and having various metabolic functions. It was originally isolated from semen.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.