S-adenosylmethionine

noun
S-aden·o·syl·me·thi·o·nine
variants: also adenosylmethionine \(ˌes-)ə-ˌden-ə-ˌsil-mə-ˈthī-ə-ˌnēn, (ˌes-)ˌad-ᵊn-ə-ˌsil- \

Medical Definition of S-adenosylmethionine 

: the active sulfonium form of methionine C15H22N6O5S that acts as a methyl group donor in various biochemical transmethylation reactions (as the formation of epinephrine or creatine), that is formed when methionine reacts with ATP, and that is an intermediate in the formation of homocysteine — see same

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occurring twice a year or every two years

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