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

ELLIS

   EuLisp LInda System.  An object-oriented Linda system written
   for EuLisp.  "Using Object-Oriented Mechanisms to Describe
   Linda", P. Broadbery  et al, in
   Linda-Like Systems and Their Implementation, G. Wilson ed, U
   Edinburgh TR 91-13, 1991.