Pronunciation: ˌ s ō -m ə -t ō - ' m ē -d ə n, s ō - ˌ ma-t ə -
Function: noun
Etymology: somat- + inter med iary + 1 -in
Date: 1971
: any of several endogenous peptides produced especially in the liver that are dependent on and prob. mediate growth hormone activity (as in sulfate uptake by epiphyseal cartilage)