Source : Webster's Revised Unabridged Dictionary (1913)

Eutectic \Eu*tec"tic\, a. [Gr. e'y`thktos easily melted; e'y^
   well + th`kein to melt.] (Physics)
   Of maximum fusibility; -- said of an alloy or mixture which
   has the lowest melting point which it is possible to obtain
   by the combination of the given components.

Source : WordNet®

eutectic
     n : a mixture of substances having a minimum melting point