[ 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.

Nearby words

  1. spermatozoon,
  2. spermaturia,
  3. spermi-,
  4. spermic,
  5. spermicide,
  6. spermiduct,
  7. spermine,
  8. spermiogenesis,
  9. spermo-,
  10. spermogonium

Origin of spermidine

First recorded in 1925–30; sperm- + -idine

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine 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.