selenomethionine
noun
sel·e·no·me·thi·o·nine
| \ -mə-ˈthī-ə-ˌnēn
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Medical Definition of selenomethionine
: a selenium analog C5H11NO2Se of methionine in which sulfur is replaced by selenium and that is used as a diagnostic aid in scintigraphy especially of the pancreas and as a dietary supplement