sel·e·no·me·thi·o·nine noun \-mə-ˈthī-ə-ˌnēn\
: 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
Seen & Heard
What made you want to look up selenomethionine? Please tell us where you read or heard it (including the quote, if possible).