The Free On-line Dictionary of Computing (30 December 2018):

Eurisko

    A language for "opportunistic
   programming" written by Doug Lenat in 1978.  Eurisko
   constructs its own methods and modifies its strategies as it
   tries to solve a problem.

   (http://homepages.enterprise.net/hibou/aicourse/lenat.txt).

   [Mentioned by Alan Kay, SIGPLAN Notices 28(3), March 1993,
   p. 88].

   (1994-12-08)