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From Ancient Greek εὔτηκτος (eútēktos, easily melted), from εὖ (, well) + τήκω (tḗkō, to melt). Coined as an adjective (along with the noun eutexia) by British scientist Frederick Guthrie in 1884.


  • (US) IPA(key): /juˈtɛk.tɪk/
  • Hyphenation: eu‧tec‧tic


eutectic (not comparable)

  1. Describing the chemical composition or temperature of a mixture of substances that gives the lowest temperature at which the mixture becomes fully molten. A further requirement is that that temperature is lower than the melting point of any of the pure component substances.
  2. (chemistry) Describing the thermodynamic equilibrium conditions where a liquid coexists with two solid phases.
    For a mixture with two components at a fixed pressure, the eutectic reaction can only happen at a fixed chemical composition and temperature, called the eutectic point.

Derived termsEdit



eutectic (plural eutectics)

  1. A material that has the composition of a eutectic mixture or eutectic alloy
  2. The temperature of the eutectic point

Usage notesEdit

  • Use with the indefinite article is mixed. The dominant usage seems to favour "a eutectic", although "an eutectic" can be found in some texts.



  • The Oxford English Dictionary