What is "spermine"

n. (context organic compound English) A polyamine, ''N,N'-bis(3-aminopropyl) butane-1,4-diamine'', originally extracted from sperm, that is involved in cellular metabolism

Spermine is a polyamine involved in cellular metabolism found in all eukaryotic cells. The precursor for synthesis of spermine is the amino acid ornithine. It is found in a wide variety of organisms and tissues and is an essential growth factor in some bacteria. It is found as a polycation at physiological pH. Spermine is associated with nucleic acids and is thought to stabilize helical structure, particularly in viruses.

Crystals of spermine phosphate were first described in 1678, in human semen, by Antonie van Leeuwenhoek. The name spermin was first used by the German chemists Ladenburg and Abel in 1888, and the correct structure of spermine was not finally established until 1926, simultaneously in England (by Dudley, Rosenheim, and Starling) and Germany (by Wrede et al.).

This compound is documented as being what primarily contributes to the characteristic odor of semen.