The Collaborative International Dictionary of English v.0.48:

Melam \Me"lam\ (m[=e]"l[a^]m), n. [Cf. F. m['e]lam.] (Chem.)
   A white or buff-colored granular powder, C6H9N11, obtained
   by heating ammonium sulphocyanate.
   [1913 Webster]