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New American Oxford Dictionary

spermidine

sper mi dine |ˈspərməˌdēn ˈspərmədin | ▶noun Biochemistry a colorless compound with a similar distribution and effect to spermine. [A polyamine; chem. formula: H 2 N (CH 2 ) 3 NH (CH 2 ) 4 NH 2. ] ORIGIN 1920s: from sperm + -ide + -ine 4 .

 

Oxford Dictionary

spermidine

spermidine |ˈspəːmɪdiːn | ▶noun [ mass noun ] Biochemistry a colourless compound with a similar distribution and effect to spermine. ●A polyamine; chem. formula: H 2 N (CH 2 ) 3 NH (CH 2 ) 4 NH 2. ORIGIN 1920s: from sperm + -ide + -ine 4 .