The Collaborative International Dictionary of English v.0.48:

Eureka \Eu*re"ka\ [Gr. ? I have found, perfect indicative of ?
   to find.]
   The exclamation attributed to Archimedes, who is said to have
   cried out "Eureka! eureka!" (I have found it! I have found
   it!), upon suddenly discovering a method of finding out how
   much the gold of King Hiero's crown had been alloyed. Hence,
   an expression of triumph concerning a discovery.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Eureka
    n 1: an alloy of copper and nickel with high electrical
         resistance and a low temperature coefficient; used as
         resistance wire [syn: constantan, Eureka]
    2: a town in northwest California on an arm of the Pacific Ocean

The Free On-line Dictionary of Computing (19 January 2023):

Eureka

   A European technological development programme.