Definition of spermidine in English:

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Pronunciation: /ˈspərməˌdēn/


A colorless compound with a similar distribution and effect to spermine.
  • A polyamine; chemical formula: H2N(CH2)3NH(CH2)4NH2.
Example sentences
  • The present study indicates that DNA resolubilization at high concentrations of spermine and spermidine is explained by formation of small particles of condensed DNA that cannot be precipitated by centrifugation.
  • These specificities lead to preferential bindings through the DNA minor groove for putrescine and spermidine, whereas spermine binds by the major groove.
  • Maybe even higher efficiencies would have been obtained using spermine instead of spermidine.


1920s: from sperm + -ide + -ine4.

For editors and proofreaders

Syllabification: sper·mi·dine

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