SPERMIDINE

ˈspərməˌdēn, -_də̇n noun

( -s )

Etymology: sperm- + -idine

: a crystalline aliphatic triamine H 2 N(CH 2 ) 3 NH(CH 2 ) 4 NH 2 , found especially in semen in association with spermine and structurally related to it and to putrescine