a basic substance, CHN, associated with nucleic acids and cell membranes, found in nearly all animal tissues: first found in human semen
See spermine in American Heritage Dictionary 4
(spûrˈmēnˌ)
noun
A crystalline polyamine compound, C10H26N4, present in ribosomes and found widely in living tissues along with spermidine. It was originally isolated from semen.