- Mydaleine My*da"le*ine, n. [Gr. myda^n to be clammy (from decay).] (Physiol. Chem.) A toxic alkaloid (ptomaine) obtained from putrid flesh and from herring brines. As a poison it is said to execute profuse diarrhoea, vomiting, and intestinal inflammation. --Brieger. [1913 Webster]
The Collaborative International Dictionary of English. 2000.